Merge commit '05fa4c89f20e9769db0e6c0b429cef2590771ace' as 'tcl8.6'

1 files changed, 3420 insertions, 0 deletions

diff --git a/tcl8.6/library/tcltest/tcltest.tcl b/tcl8.6/library/tcltest/tcltest.tcl
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+# tcltest.tcl --
+#
+#	This file contains support code for the Tcl test suite.  It
+#       defines the tcltest namespace and finds and defines the output
+#       directory, constraints available, output and error channels,
+#	etc. used by Tcl tests.  See the tcltest man page for more
+#	details.
+#
+#       This design was based on the Tcl testing approach designed and
+#       initially implemented by Mary Ann May-Pumphrey of Sun
+#	Microsystems.
+#
+# Copyright (c) 1994-1997 Sun Microsystems, Inc.
+# Copyright (c) 1998-1999 by Scriptics Corporation.
+# Copyright (c) 2000 by Ajuba Solutions
+# Contributions from Don Porter, NIST, 2002.  (not subject to US copyright)
+# All rights reserved.
+
+package require Tcl 8.5		;# -verbose line uses [info frame]
+namespace eval tcltest {
+
+    # When the version number changes, be sure to update the pkgIndex.tcl file,
+    # and the install directory in the Makefiles.  When the minor version
+    # changes (new feature) be sure to update the man page as well.
+    variable Version 2.4.0
+
+    # Compatibility support for dumb variables defined in tcltest 1
+    # Do not use these.  Call [package provide Tcl] and [info patchlevel]
+    # yourself.  You don't need tcltest to wrap it for you.
+    variable version [package provide Tcl]
+    variable patchLevel [info patchlevel]
+
+##### Export the public tcltest procs; several categories
+    #
+    # Export the main functional commands that do useful things
+    namespace export cleanupTests loadTestedCommands makeDirectory \
+	makeFile removeDirectory removeFile runAllTests test
+
+    # Export configuration commands that control the functional commands
+    namespace export configure customMatch errorChannel interpreter \
+	    outputChannel testConstraint
+
+    # Export commands that are duplication (candidates for deprecation)
+    namespace export bytestring		;# dups [encoding convertfrom identity]
+    namespace export debug		;#	[configure -debug]
+    namespace export errorFile		;#	[configure -errfile]
+    namespace export limitConstraints	;#	[configure -limitconstraints]
+    namespace export loadFile		;#	[configure -loadfile]
+    namespace export loadScript		;#	[configure -load]
+    namespace export match		;#	[configure -match]
+    namespace export matchFiles		;#	[configure -file]
+    namespace export matchDirectories	;#	[configure -relateddir]
+    namespace export normalizeMsg	;#	application of [customMatch]
+    namespace export normalizePath	;#	[file normalize] (8.4)
+    namespace export outputFile		;#	[configure -outfile]
+    namespace export preserveCore	;#	[configure -preservecore]
+    namespace export singleProcess	;#	[configure -singleproc]
+    namespace export skip		;#	[configure -skip]
+    namespace export skipFiles		;#	[configure -notfile]
+    namespace export skipDirectories	;#	[configure -asidefromdir]
+    namespace export temporaryDirectory	;#	[configure -tmpdir]
+    namespace export testsDirectory	;#	[configure -testdir]
+    namespace export verbose		;#	[configure -verbose]
+    namespace export viewFile		;#	binary encoding [read]
+    namespace export workingDirectory	;#	[cd] [pwd]
+
+    # Export deprecated commands for tcltest 1 compatibility
+    namespace export getMatchingFiles mainThread restoreState saveState \
+	    threadReap
+
+    # tcltest::normalizePath --
+    #
+    #     This procedure resolves any symlinks in the path thus creating
+    #     a path without internal redirection. It assumes that the
+    #     incoming path is absolute.
+    #
+    # Arguments
+    #     pathVar - name of variable containing path to modify.
+    #
+    # Results
+    #     The path is modified in place.
+    #
+    # Side Effects:
+    #     None.
+    #
+    proc normalizePath {pathVar} {
+	upvar 1 $pathVar path
+	set oldpwd [pwd]
+	catch {cd $path}
+	set path [pwd]
+	cd $oldpwd
+	return $path
+    }
+
+##### Verification commands used to test values of variables and options
+    #
+    # Verification command that accepts everything
+    proc AcceptAll {value} {
+	return $value
+    }
+
+    # Verification command that accepts valid Tcl lists
+    proc AcceptList { list } {
+	return [lrange $list 0 end]
+    }
+
+    # Verification command that accepts a glob pattern
+    proc AcceptPattern { pattern } {
+	return [AcceptAll $pattern]
+    }
+
+    # Verification command that accepts integers
+    proc AcceptInteger { level } {
+	return [incr level 0]
+    }
+
+    # Verification command that accepts boolean values
+    proc AcceptBoolean { boolean } {
+	return [expr {$boolean && $boolean}]
+    }
+
+    # Verification command that accepts (syntactically) valid Tcl scripts
+    proc AcceptScript { script } {
+	if {![info complete $script]} {
+	    return -code error "invalid Tcl script: $script"
+	}
+	return $script
+    }
+
+    # Verification command that accepts (converts to) absolute pathnames
+    proc AcceptAbsolutePath { path } {
+	return [file join [pwd] $path]
+    }
+
+    # Verification command that accepts existing readable directories
+    proc AcceptReadable { path } {
+	if {![file readable $path]} {
+	    return -code error "\"$path\" is not readable"
+	}
+	return $path
+    }
+    proc AcceptDirectory { directory } {
+	set directory [AcceptAbsolutePath $directory]
+	if {![file exists $directory]} {
+	    return -code error "\"$directory\" does not exist"
+	}
+	if {![file isdir $directory]} {
+	    return -code error "\"$directory\" is not a directory"
+	}
+	return [AcceptReadable $directory]
+    }
+
+##### Initialize internal arrays of tcltest, but only if the caller
+    # has not already pre-initialized them.  This is done to support
+    # compatibility with older tests that directly access internals
+    # rather than go through command interfaces.
+    #
+    proc ArrayDefault {varName value} {
+	variable $varName
+	if {[array exists $varName]} {
+	    return
+	}
+	if {[info exists $varName]} {
+	    # Pre-initialized value is a scalar: destroy it!
+	    unset $varName
+	}
+	array set $varName $value
+    }
+
+    # save the original environment so that it can be restored later
+    ArrayDefault originalEnv [array get ::env]
+
+    # initialize numTests array to keep track of the number of tests
+    # that pass, fail, and are skipped.
+    ArrayDefault numTests [list Total 0 Passed 0 Skipped 0 Failed 0]
+
+    # createdNewFiles will store test files as indices and the list of
+    # files (that should not have been) left behind by the test files
+    # as values.
+    ArrayDefault createdNewFiles {}
+
+    # initialize skippedBecause array to keep track of constraints that
+    # kept tests from running; a constraint name of "userSpecifiedSkip"
+    # means that the test appeared on the list of tests that matched the
+    # -skip value given to the flag; "userSpecifiedNonMatch" means that
+    # the test didn't match the argument given to the -match flag; both
+    # of these constraints are counted only if tcltest::debug is set to
+    # true.
+    ArrayDefault skippedBecause {}
+
+    # initialize the testConstraints array to keep track of valid
+    # predefined constraints (see the explanation for the
+    # InitConstraints proc for more details).
+    ArrayDefault testConstraints {}
+
+##### Initialize internal variables of tcltest, but only if the caller
+    # has not already pre-initialized them.  This is done to support
+    # compatibility with older tests that directly access internals
+    # rather than go through command interfaces.
+    #
+    proc Default {varName value {verify AcceptAll}} {
+	variable $varName
+	if {![info exists $varName]} {
+	    variable $varName [$verify $value]
+	} else {
+	    variable $varName [$verify [set $varName]]
+	}
+    }
+
+    # Save any arguments that we might want to pass through to other
+    # programs.  This is used by the -args flag.
+    # FINDUSER
+    Default parameters {}
+
+    # Count the number of files tested (0 if runAllTests wasn't called).
+    # runAllTests will set testSingleFile to false, so stats will
+    # not be printed until runAllTests calls the cleanupTests proc.
+    # The currentFailure var stores the boolean value of whether the
+    # current test file has had any failures.  The failFiles list
+    # stores the names of test files that had failures.
+    Default numTestFiles 0 AcceptInteger
+    Default testSingleFile true AcceptBoolean
+    Default currentFailure false AcceptBoolean
+    Default failFiles {} AcceptList
+
+    # Tests should remove all files they create.  The test suite will
+    # check the current working dir for files created by the tests.
+    # filesMade keeps track of such files created using the makeFile and
+    # makeDirectory procedures.  filesExisted stores the names of
+    # pre-existing files.
+    #
+    # Note that $filesExisted lists only those files that exist in
+    # the original [temporaryDirectory].
+    Default filesMade {} AcceptList
+    Default filesExisted {} AcceptList
+    proc FillFilesExisted {} {
+	variable filesExisted
+
+	# Save the names of files that already exist in the scratch directory.
+	foreach file [glob -nocomplain -directory [temporaryDirectory] *] {
+	    lappend filesExisted [file tail $file]
+	}
+
+	# After successful filling, turn this into a no-op.
+	proc FillFilesExisted args {}
+    }
+
+    # Kept only for compatibility
+    Default constraintsSpecified {} AcceptList
+    trace add variable constraintsSpecified read [namespace code {
+	    set constraintsSpecified [array names testConstraints] ;#}]
+
+    # tests that use threads need to know which is the main thread
+    Default mainThread 1
+    variable mainThread
+    if {[info commands thread::id] ne {}} {
+	set mainThread [thread::id]
+    } elseif {[info commands testthread] ne {}} {
+	set mainThread [testthread id]
+    }
+
+    # Set workingDirectory to [pwd]. The default output directory for
+    # Tcl tests is the working directory.  Whenever this value changes
+    # change to that directory.
+    variable workingDirectory
+    trace add variable workingDirectory write \
+	    [namespace code {cd $workingDirectory ;#}]
+
+    Default workingDirectory [pwd] AcceptAbsolutePath
+    proc workingDirectory { {dir ""} } {
+	variable workingDirectory
+	if {[llength [info level 0]] == 1} {
+	    return $workingDirectory
+	}
+	set workingDirectory [AcceptAbsolutePath $dir]
+    }
+
+    # Set the location of the execuatble
+    Default tcltest [info nameofexecutable]
+    trace add variable tcltest write [namespace code {testConstraint stdio \
+	    [eval [ConstraintInitializer stdio]] ;#}]
+
+    # save the platform information so it can be restored later
+    Default originalTclPlatform [array get ::tcl_platform]
+
+    # If a core file exists, save its modification time.
+    if {[file exists [file join [workingDirectory] core]]} {
+	Default coreModTime \
+		[file mtime [file join [workingDirectory] core]]
+    }
+
+    # stdout and stderr buffers for use when we want to store them
+    Default outData {}
+    Default errData {}
+
+    # keep track of test level for nested test commands
+    variable testLevel 0
+
+    # the variables and procs that existed when saveState was called are
+    # stored in a variable of the same name
+    Default saveState {}
+
+    # Internationalization support -- used in [SetIso8859_1_Locale] and
+    # [RestoreLocale]. Those commands are used in cmdIL.test.
+
+    if {![info exists [namespace current]::isoLocale]} {
+	variable isoLocale fr
+	switch -- $::tcl_platform(platform) {
+	    "unix" {
+
+		# Try some 'known' values for some platforms:
+
+		switch -exact -- $::tcl_platform(os) {
+		    "FreeBSD" {
+			set isoLocale fr_FR.ISO_8859-1
+		    }
+		    HP-UX {
+			set isoLocale fr_FR.iso88591
+		    }
+		    Linux -
+		    IRIX {
+			set isoLocale fr
+		    }
+		    default {
+
+			# Works on SunOS 4 and Solaris, and maybe
+			# others...  Define it to something else on your
+			# system if you want to test those.
+
+			set isoLocale iso_8859_1
+		    }
+		}
+	    }
+	    "windows" {
+		set isoLocale French
+	    }
+	}
+    }
+
+    variable ChannelsWeOpened; array set ChannelsWeOpened {}
+    # output goes to stdout by default
+    Default outputChannel stdout
+    proc outputChannel { {filename ""} } {
+	variable outputChannel
+	variable ChannelsWeOpened
+
+	# This is very subtle and tricky, so let me try to explain.
+	# (Hopefully this longer comment will be clear when I come
+	# back in a few months, unlike its predecessor :) )
+	#
+	# The [outputChannel] command (and underlying variable) have to
+	# be kept in sync with the [configure -outfile] configuration
+	# option ( and underlying variable Option(-outfile) ).  This is
+	# accomplished with a write trace on Option(-outfile) that will
+	# update [outputChannel] whenver a new value is written.  That
+	# much is easy.
+	#
+	# The trick is that in order to maintain compatibility with
+	# version 1 of tcltest, we must allow every configuration option
+	# to get its inital value from command line arguments.  This is
+	# accomplished by setting initial read traces on all the
+	# configuration options to parse the command line option the first
+	# time they are read.  These traces are cancelled whenever the
+	# program itself calls [configure].
+	#
+	# OK, then so to support tcltest 1 compatibility, it seems we want
+	# to get the return from [outputFile] to trigger the read traces,
+	# just in case.
+	#
+	# BUT!  A little known feature of Tcl variable traces is that
+	# traces are disabled during the handling of other traces.  So,
+	# if we trigger read traces on Option(-outfile) and that triggers
+	# command line parsing which turns around and sets an initial
+	# value for Option(-outfile) -- <whew!> -- the write trace that
+	# would keep [outputChannel] in sync with that new initial value
+	# would not fire!
+	#
+	# SO, finally, as a workaround, instead of triggering read traces
+	# by invoking [outputFile], we instead trigger the same set of
+	# read traces by invoking [debug].  Any command that reads a
+	# configuration option would do.  [debug] is just a handy one.
+	# The end result is that we support tcltest 1 compatibility and
+	# keep outputChannel and -outfile in sync in all cases.
+	debug
+
+	if {[llength [info level 0]] == 1} {
+	    return $outputChannel
+	}
+	if {[info exists ChannelsWeOpened($outputChannel)]} {
+	    close $outputChannel
+	    unset ChannelsWeOpened($outputChannel)
+	}
+	switch -exact -- $filename {
+	    stderr -
+	    stdout {
+		set outputChannel $filename
+	    }
+	    default {
+		set outputChannel [open $filename a]
+		set ChannelsWeOpened($outputChannel) 1
+
+		# If we created the file in [temporaryDirectory], then
+		# [cleanupTests] will delete it, unless we claim it was
+		# already there.
+		set outdir [normalizePath [file dirname \
+			[file join [pwd] $filename]]]
+		if {$outdir eq [temporaryDirectory]} {
+		    variable filesExisted
+		    FillFilesExisted
+		    set filename [file tail $filename]
+		    if {$filename ni $filesExisted} {
+			lappend filesExisted $filename
+		    }
+		}
+	    }
+	}
+	return $outputChannel
+    }
+
+    # errors go to stderr by default
+    Default errorChannel stderr
+    proc errorChannel { {filename ""} } {
+	variable errorChannel
+	variable ChannelsWeOpened
+
+	# This is subtle and tricky.  See the comment above in
+	# [outputChannel] for a detailed explanation.
+	debug
+
+	if {[llength [info level 0]] == 1} {
+	    return $errorChannel
+	}
+	if {[info exists ChannelsWeOpened($errorChannel)]} {
+	    close $errorChannel
+	    unset ChannelsWeOpened($errorChannel)
+	}
+	switch -exact -- $filename {
+	    stderr -
+	    stdout {
+		set errorChannel $filename
+	    }
+	    default {
+		set errorChannel [open $filename a]
+		set ChannelsWeOpened($errorChannel) 1
+
+		# If we created the file in [temporaryDirectory], then
+		# [cleanupTests] will delete it, unless we claim it was
+		# already there.
+		set outdir [normalizePath [file dirname \
+			[file join [pwd] $filename]]]
+		if {$outdir eq [temporaryDirectory]} {
+		    variable filesExisted
+		    FillFilesExisted
+		    set filename [file tail $filename]
+		    if {$filename ni $filesExisted} {
+			lappend filesExisted $filename
+		    }
+		}
+	    }
+	}
+	return $errorChannel
+    }
+
+##### Set up the configurable options
+    #
+    # The configurable options of the package
+    variable Option; array set Option {}
+
+    # Usage strings for those options
+    variable Usage; array set Usage {}
+
+    # Verification commands for those options
+    variable Verify; array set Verify {}
+
+    # Initialize the default values of the configurable options that are
+    # historically associated with an exported variable.  If that variable
+    # is already set, support compatibility by accepting its pre-set value.
+    # Use [trace] to establish ongoing connection between the deprecated
+    # exported variable and the modern option kept as a true internal var.
+    # Also set up usage string and value testing for the option.
+    proc Option {option value usage {verify AcceptAll} {varName {}}} {
+	variable Option
+	variable Verify
+	variable Usage
+	variable OptionControlledVariables
+	variable DefaultValue
+	set Usage($option) $usage
+	set Verify($option) $verify
+	set DefaultValue($option) $value
+	if {[catch {$verify $value} msg]} {
+	    return -code error $msg
+	} else {
+	    set Option($option) $msg
+	}
+	if {[string length $varName]} {
+	    variable $varName
+	    if {[info exists $varName]} {
+		if {[catch {$verify [set $varName]} msg]} {
+		    return -code error $msg
+		} else {
+		    set Option($option) $msg
+		}
+		unset $varName
+	    }
+	    namespace eval [namespace current] \
+	    	    [list upvar 0 Option($option) $varName]
+	    # Workaround for Bug (now Feature Request) 572889.  Grrrr....
+	    # Track all the variables tied to options
+	    lappend OptionControlledVariables $varName
+	    # Later, set auto-configure read traces on all
+	    # of them, since a single trace on Option does not work.
+	    proc $varName {{value {}}} [subst -nocommands {
+		if {[llength [info level 0]] == 2} {
+		    Configure $option [set value]
+		}
+		return [Configure $option]
+	    }]
+	}
+    }
+
+    proc MatchingOption {option} {
+	variable Option
+	set match [array names Option $option*]
+	switch -- [llength $match] {
+	    0 {
+		set sorted [lsort [array names Option]]
+		set values [join [lrange $sorted 0 end-1] ", "]
+		append values ", or [lindex $sorted end]"
+		return -code error "unknown option $option: should be\
+			one of $values"
+	    }
+	    1 {
+		return [lindex $match 0]
+	    }
+	    default {
+		# Exact match trumps ambiguity
+		if {$option in $match} {
+		    return $option
+		}
+		set values [join [lrange $match 0 end-1] ", "]
+		append values ", or [lindex $match end]"
+		return -code error "ambiguous option $option:\
+			could match $values"
+	    }
+	}
+    }
+
+    proc EstablishAutoConfigureTraces {} {
+	variable OptionControlledVariables
+	foreach varName [concat $OptionControlledVariables Option] {
+	    variable $varName
+	    trace add variable $varName read [namespace code {
+		    ProcessCmdLineArgs ;#}]
+	}
+    }
+
+    proc RemoveAutoConfigureTraces {} {
+	variable OptionControlledVariables
+	foreach varName [concat $OptionControlledVariables Option] {
+	    variable $varName
+	    foreach pair [trace info variable $varName] {
+		lassign $pair op cmd
+		if {($op eq "read") &&
+			[string match *ProcessCmdLineArgs* $cmd]} {
+		    trace remove variable $varName $op $cmd
+		}
+	    }
+	}
+	# Once the traces are removed, this can become a no-op
+	proc RemoveAutoConfigureTraces {} {}
+    }
+
+    proc Configure args {
+	variable Option
+	variable Verify
+	set n [llength $args]
+	if {$n == 0} {
+	    return [lsort [array names Option]]
+	}
+	if {$n == 1} {
+	    if {[catch {MatchingOption [lindex $args 0]} option]} {
+		return -code error $option
+	    }
+	    return $Option($option)
+	}
+	while {[llength $args] > 1} {
+	    if {[catch {MatchingOption [lindex $args 0]} option]} {
+		return -code error $option
+	    }
+	    if {[catch {$Verify($option) [lindex $args 1]} value]} {
+		return -code error "invalid $option\
+			value \"[lindex $args 1]\": $value"
+	    }
+	    set Option($option) $value
+	    set args [lrange $args 2 end]
+	}
+	if {[llength $args]} {
+	    if {[catch {MatchingOption [lindex $args 0]} option]} {
+		return -code error $option
+	    }
+	    return -code error "missing value for option $option"
+	}
+    }
+    proc configure args {
+	if {[llength $args] > 1} {
+	    RemoveAutoConfigureTraces
+	}
+	set code [catch {Configure {*}$args} msg]
+	return -code $code $msg
+    }
+
+    proc AcceptVerbose { level } {
+	set level [AcceptList $level]
+	set levelMap {
+	    l list
+	    p pass
+	    b body
+	    s skip
+	    t start
+	    e error
+	    l line
+	    m msec
+	    u usec
+	}
+	set levelRegexp "^([join [dict values $levelMap] |])\$"
+	if {[llength $level] == 1} {
+	    if {![regexp $levelRegexp $level]} {
+		# translate single characters abbreviations to expanded list
+		set level [string map $levelMap [split $level {}]]
+	    }
+	}
+	set valid [list]
+	foreach v $level {
+	    if {[regexp $levelRegexp $v]} {
+		lappend valid $v
+	    }
+	}
+	return $valid
+    }
+
+    proc IsVerbose {level} {
+	variable Option
+	return [expr {[lsearch -exact $Option(-verbose) $level] != -1}]
+    }
+
+    # Default verbosity is to show bodies of failed tests
+    Option -verbose {body error} {
+	Takes any combination of the values 'p', 's', 'b', 't', 'e' and 'l'.
+	Test suite will display all passed tests if 'p' is specified, all
+	skipped tests if 's' is specified, the bodies of failed tests if
+	'b' is specified, and when tests start if 't' is specified.
+	ErrorInfo is displayed if 'e' is specified. Source file line
+	information of failed tests is displayed if 'l' is specified.
+    } AcceptVerbose verbose
+
+    # Match and skip patterns default to the empty list, except for
+    # matchFiles, which defaults to all .test files in the
+    # testsDirectory and matchDirectories, which defaults to all
+    # directories.
+    Option -match * {
+	Run all tests within the specified files that match one of the
+	list of glob patterns given.
+    } AcceptList match
+
+    Option -skip {} {
+	Skip all tests within the specified tests (via -match) and files
+	that match one of the list of glob patterns given.
+    } AcceptList skip
+
+    Option -file *.test {
+	Run tests in all test files that match the glob pattern given.
+    } AcceptPattern matchFiles
+
+    # By default, skip files that appear to be SCCS lock files.
+    Option -notfile l.*.test {
+	Skip all test files that match the glob pattern given.
+    } AcceptPattern skipFiles
+
+    Option -relateddir * {
+	Run tests in directories that match the glob pattern given.
+    } AcceptPattern matchDirectories
+
+    Option -asidefromdir {} {
+	Skip tests in directories that match the glob pattern given.
+    } AcceptPattern skipDirectories
+
+    # By default, don't save core files
+    Option -preservecore 0 {
+	If 2, save any core files produced during testing in the directory
+	specified by -tmpdir. If 1, notify the user if core files are
+	created.
+    } AcceptInteger preserveCore
+
+    # debug output doesn't get printed by default; debug level 1 spits
+    # up only the tests that were skipped because they didn't match or
+    # were specifically skipped.  A debug level of 2 would spit up the
+    # tcltest variables and flags provided; a debug level of 3 causes
+    # some additional output regarding operations of the test harness.
+    # The tcltest package currently implements only up to debug level 3.
+    Option -debug 0 {
+	Internal debug level
+    } AcceptInteger debug
+
+    proc SetSelectedConstraints args {
+	variable Option
+	foreach c $Option(-constraints) {
+	    testConstraint $c 1
+	}
+    }
+    Option -constraints {} {
+	Do not skip the listed constraints listed in -constraints.
+    } AcceptList
+    trace add variable Option(-constraints) write \
+	    [namespace code {SetSelectedConstraints ;#}]
+
+    # Don't run only the "-constraint" specified tests by default
+    proc ClearUnselectedConstraints args {
+	variable Option
+	variable testConstraints
+	if {!$Option(-limitconstraints)} {return}
+	foreach c [array names testConstraints] {
+	    if {$c ni $Option(-constraints)} {
+		testConstraint $c 0
+	    }
+	}
+    }
+    Option -limitconstraints 0 {
+	whether to run only tests with the constraints
+    } AcceptBoolean limitConstraints
+    trace add variable Option(-limitconstraints) write \
+	    [namespace code {ClearUnselectedConstraints ;#}]
+
+    # A test application has to know how to load the tested commands
+    # into the interpreter.
+    Option -load {} {
+	Specifies the script to load the tested commands.
+    } AcceptScript loadScript
+
+    # Default is to run each test file in a separate process
+    Option -singleproc 0 {
+	whether to run all tests in one process
+    } AcceptBoolean singleProcess
+
+    proc AcceptTemporaryDirectory { directory } {
+	set directory [AcceptAbsolutePath $directory]
+	if {![file exists $directory]} {
+	    file mkdir $directory
+	}
+	set directory [AcceptDirectory $directory]
+	if {![file writable $directory]} {
+	    if {[workingDirectory] eq $directory} {
+		# Special exception: accept the default value
+		# even if the directory is not writable
+		return $directory
+	    }
+	    return -code error "\"$directory\" is not writeable"
+	}
+	return $directory
+    }
+
+    # Directory where files should be created
+    Option -tmpdir [workingDirectory] {
+	Save temporary files in the specified directory.
+    } AcceptTemporaryDirectory temporaryDirectory
+    trace add variable Option(-tmpdir) write \
+	    [namespace code {normalizePath Option(-tmpdir) ;#}]
+
+    # Tests should not rely on the current working directory.
+    # Files that are part of the test suite should be accessed relative
+    # to [testsDirectory]
+    Option -testdir [workingDirectory] {
+	Search tests in the specified directory.
+    } AcceptDirectory testsDirectory
+    trace add variable Option(-testdir) write \
+	    [namespace code {normalizePath Option(-testdir) ;#}]
+
+    proc AcceptLoadFile { file } {
+	if {$file eq {}} {return $file}
+	set file [file join [temporaryDirectory] $file]
+	return [AcceptReadable $file]
+    }
+    proc ReadLoadScript {args} {
+	variable Option
+	if {$Option(-loadfile) eq {}} {return}
+	set tmp [open $Option(-loadfile) r]
+	loadScript [read $tmp]
+	close $tmp
+    }
+    Option -loadfile {} {
+	Read the script to load the tested commands from the specified file.
+    } AcceptLoadFile loadFile
+    trace add variable Option(-loadfile) write [namespace code ReadLoadScript]
+
+    proc AcceptOutFile { file } {
+	if {[string equal stderr $file]} {return $file}
+	if {[string equal stdout $file]} {return $file}
+	return [file join [temporaryDirectory] $file]
+    }
+
+    # output goes to stdout by default
+    Option -outfile stdout {
+	Send output from test runs to the specified file.
+    } AcceptOutFile outputFile
+    trace add variable Option(-outfile) write \
+	    [namespace code {outputChannel $Option(-outfile) ;#}]
+
+    # errors go to stderr by default
+    Option -errfile stderr {
+	Send errors from test runs to the specified file.
+    } AcceptOutFile errorFile
+    trace add variable Option(-errfile) write \
+	    [namespace code {errorChannel $Option(-errfile) ;#}]
+
+    proc loadIntoSlaveInterpreter {slave args} {
+	variable Version
+	interp eval $slave [package ifneeded tcltest $Version]
+	interp eval $slave "tcltest::configure {*}{$args}"
+	interp alias $slave ::tcltest::ReportToMaster \
+	    {} ::tcltest::ReportedFromSlave
+    }
+    proc ReportedFromSlave {total passed skipped failed because newfiles} {
+	variable numTests
+	variable skippedBecause
+	variable createdNewFiles
+	incr numTests(Total)   $total
+	incr numTests(Passed)  $passed
+	incr numTests(Skipped) $skipped
+	incr numTests(Failed)  $failed
+	foreach {constraint count} $because {
+	    incr skippedBecause($constraint) $count
+	}
+	foreach {testfile created} $newfiles {
+	    lappend createdNewFiles($testfile) {*}$created
+	}
+	return
+    }
+}
+
+#####################################################################
+
+# tcltest::Debug* --
+#
+#     Internal helper procedures to write out debug information
+#     dependent on the chosen level. A test shell may overide
+#     them, f.e. to redirect the output into a different
+#     channel, or even into a GUI.
+
+# tcltest::DebugPuts --
+#
+#     Prints the specified string if the current debug level is
+#     higher than the provided level argument.
+#
+# Arguments:
+#     level   The lowest debug level triggering the output
+#     string  The string to print out.
+#
+# Results:
+#     Prints the string. Nothing else is allowed.
+#
+# Side Effects:
+#     None.
+#
+
+proc tcltest::DebugPuts {level string} {
+    variable debug
+    if {$debug >= $level} {
+	puts $string
+    }
+    return
+}
+
+# tcltest::DebugPArray --
+#
+#     Prints the contents of the specified array if the current
+#       debug level is higher than the provided level argument
+#
+# Arguments:
+#     level           The lowest debug level triggering the output
+#     arrayvar        The name of the array to print out.
+#
+# Results:
+#     Prints the contents of the array. Nothing else is allowed.
+#
+# Side Effects:
+#     None.
+#
+
+proc tcltest::DebugPArray {level arrayvar} {
+    variable debug
+
+    if {$debug >= $level} {
+	catch {upvar 1 $arrayvar $arrayvar}
+	parray $arrayvar
+    }
+    return
+}
+
+# Define our own [parray] in ::tcltest that will inherit use of the [puts]
+# defined in ::tcltest.  NOTE: Ought to construct with [info args] and
+# [info default], but can't be bothered now.  If [parray] changes, then
+# this will need changing too.
+auto_load ::parray
+proc tcltest::parray {a {pattern *}} [info body ::parray]
+
+# tcltest::DebugDo --
+#
+#     Executes the script if the current debug level is greater than
+#       the provided level argument
+#
+# Arguments:
+#     level   The lowest debug level triggering the execution.
+#     script  The tcl script executed upon a debug level high enough.
+#
+# Results:
+#     Arbitrary side effects, dependent on the executed script.
+#
+# Side Effects:
+#     None.
+#
+
+proc tcltest::DebugDo {level script} {
+    variable debug
+
+    if {$debug >= $level} {
+	uplevel 1 $script
+    }
+    return
+}
+
+#####################################################################
+
+proc tcltest::Warn {msg} {
+    puts [outputChannel] "WARNING: $msg"
+}
+
+# tcltest::mainThread
+#
+#     Accessor command for tcltest variable mainThread.
+#
+proc tcltest::mainThread { {new ""} } {
+    variable mainThread
+    if {[llength [info level 0]] == 1} {
+	return $mainThread
+    }
+    set mainThread $new
+}
+
+# tcltest::testConstraint --
+#
+#	sets a test constraint to a value; to do multiple constraints,
+#       call this proc multiple times.  also returns the value of the
+#       named constraint if no value was supplied.
+#
+# Arguments:
+#	constraint - name of the constraint
+#       value - new value for constraint (should be boolean) - if not
+#               supplied, this is a query
+#
+# Results:
+#	content of tcltest::testConstraints($constraint)
+#
+# Side effects:
+#	none
+
+proc tcltest::testConstraint {constraint {value ""}} {
+    variable testConstraints
+    variable Option
+    DebugPuts 3 "entering testConstraint $constraint $value"
+    if {[llength [info level 0]] == 2} {
+	return $testConstraints($constraint)
+    }
+    # Check for boolean values
+    if {[catch {expr {$value && $value}} msg]} {
+	return -code error $msg
+    }
+    if {[limitConstraints] && ($constraint ni $Option(-constraints))} {
+	set value 0
+    }
+    set testConstraints($constraint) $value
+}
+
+# tcltest::interpreter --
+#
+#	the interpreter name stored in tcltest::tcltest
+#
+# Arguments:
+#	executable name
+#
+# Results:
+#	content of tcltest::tcltest
+#
+# Side effects:
+#	None.
+
+proc tcltest::interpreter { {interp ""} } {
+    variable tcltest
+    if {[llength [info level 0]] == 1} {
+	return $tcltest
+    }
+    set tcltest $interp
+}
+
+#####################################################################
+
+# tcltest::AddToSkippedBecause --
+#
+#	Increments the variable used to track how many tests were
+#       skipped because of a particular constraint.
+#
+# Arguments:
+#	constraint     The name of the constraint to be modified
+#
+# Results:
+#	Modifies tcltest::skippedBecause; sets the variable to 1 if
+#       didn't previously exist - otherwise, it just increments it.
+#
+# Side effects:
+#	None.
+
+proc tcltest::AddToSkippedBecause { constraint {value 1}} {
+    # add the constraint to the list of constraints that kept tests
+    # from running
+    variable skippedBecause
+
+    if {[info exists skippedBecause($constraint)]} {
+	incr skippedBecause($constraint) $value
+    } else {
+	set skippedBecause($constraint) $value
+    }
+    return
+}
+
+# tcltest::PrintError --
+#
+#	Prints errors to tcltest::errorChannel and then flushes that
+#       channel, making sure that all messages are < 80 characters per
+#       line.
+#
+# Arguments:
+#	errorMsg     String containing the error to be printed
+#
+# Results:
+#	None.
+#
+# Side effects:
+#	None.
+
+proc tcltest::PrintError {errorMsg} {
+    set InitialMessage "Error:  "
+    set InitialMsgLen  [string length $InitialMessage]
+    puts -nonewline [errorChannel] $InitialMessage
+
+    # Keep track of where the end of the string is.
+    set endingIndex [string length $errorMsg]
+
+    if {$endingIndex < (80 - $InitialMsgLen)} {
+	puts [errorChannel] $errorMsg
+    } else {
+	# Print up to 80 characters on the first line, including the
+	# InitialMessage.
+	set beginningIndex [string last " " [string range $errorMsg 0 \
+		[expr {80 - $InitialMsgLen}]]]
+	puts [errorChannel] [string range $errorMsg 0 $beginningIndex]
+
+	while {$beginningIndex ne "end"} {
+	    puts -nonewline [errorChannel] \
+		    [string repeat " " $InitialMsgLen]
+	    if {($endingIndex - $beginningIndex)
+		    < (80 - $InitialMsgLen)} {
+		puts [errorChannel] [string trim \
+			[string range $errorMsg $beginningIndex end]]
+		break
+	    } else {
+		set newEndingIndex [expr {[string last " " \
+			[string range $errorMsg $beginningIndex \
+				[expr {$beginningIndex
+					+ (80 - $InitialMsgLen)}]
+		]] + $beginningIndex}]
+		if {($newEndingIndex <= 0)
+			|| ($newEndingIndex <= $beginningIndex)} {
+		    set newEndingIndex end
+		}
+		puts [errorChannel] [string trim \
+			[string range $errorMsg \
+			    $beginningIndex $newEndingIndex]]
+		set beginningIndex $newEndingIndex
+	    }
+	}
+    }
+    flush [errorChannel]
+    return
+}
+
+# tcltest::SafeFetch --
+#
+#	 The following trace procedure makes it so that we can safely
+#        refer to non-existent members of the testConstraints array
+#        without causing an error.  Instead, reading a non-existent
+#        member will return 0. This is necessary because tests are
+#        allowed to use constraint "X" without ensuring that
+#        testConstraints("X") is defined.
+#
+# Arguments:
+#	n1 - name of the array (testConstraints)
+#       n2 - array key value (constraint name)
+#       op - operation performed on testConstraints (generally r)
+#
+# Results:
+#	none
+#
+# Side effects:
+#	sets testConstraints($n2) to 0 if it's referenced but never
+#       before used
+
+proc tcltest::SafeFetch {n1 n2 op} {
+    variable testConstraints
+    DebugPuts 3 "entering SafeFetch $n1 $n2 $op"
+    if {$n2 eq {}} {return}
+    if {![info exists testConstraints($n2)]} {
+	if {[catch {testConstraint $n2 [eval [ConstraintInitializer $n2]]}]} {
+	    testConstraint $n2 0
+	}
+    }
+}
+
+# tcltest::ConstraintInitializer --
+#
+#	Get or set a script that when evaluated in the tcltest namespace
+#	will return a boolean value with which to initialize the
+#	associated constraint.
+#
+# Arguments:
+#	constraint - name of the constraint initialized by the script
+#	script - the initializer script
+#
+# Results
+#	boolean value of the constraint - enabled or disabled
+#
+# Side effects:
+#	Constraint is initialized for future reference by [test]
+proc tcltest::ConstraintInitializer {constraint {script ""}} {
+    variable ConstraintInitializer
+    DebugPuts 3 "entering ConstraintInitializer $constraint $script"
+    if {[llength [info level 0]] == 2} {
+	return $ConstraintInitializer($constraint)
+    }
+    # Check for boolean values
+    if {![info complete $script]} {
+	return -code error "ConstraintInitializer must be complete script"
+    }
+    set ConstraintInitializer($constraint) $script
+}
+
+# tcltest::InitConstraints --
+#
+# Call all registered constraint initializers to force initialization
+# of all known constraints.
+# See the tcltest man page for the list of built-in constraints defined
+# in this procedure.
+#
+# Arguments:
+#	none
+#
+# Results:
+#	The testConstraints array is reset to have an index for each
+#	built-in test constraint.
+#
+# Side Effects:
+#       None.
+#
+
+proc tcltest::InitConstraints {} {
+    variable ConstraintInitializer
+    initConstraintsHook
+    foreach constraint [array names ConstraintInitializer] {
+	testConstraint $constraint
+    }
+}
+
+proc tcltest::DefineConstraintInitializers {} {
+    ConstraintInitializer singleTestInterp {singleProcess}
+
+    # All the 'pc' constraints are here for backward compatibility and
+    # are not documented.  They have been replaced with equivalent 'win'
+    # constraints.
+
+    ConstraintInitializer unixOnly \
+	    {string equal $::tcl_platform(platform) unix}
+    ConstraintInitializer macOnly \
+	    {string equal $::tcl_platform(platform) macintosh}
+    ConstraintInitializer pcOnly \
+	    {string equal $::tcl_platform(platform) windows}
+    ConstraintInitializer winOnly \
+	    {string equal $::tcl_platform(platform) windows}
+
+    ConstraintInitializer unix {testConstraint unixOnly}
+    ConstraintInitializer mac {testConstraint macOnly}
+    ConstraintInitializer pc {testConstraint pcOnly}
+    ConstraintInitializer win {testConstraint winOnly}
+
+    ConstraintInitializer unixOrPc \
+	    {expr {[testConstraint unix] || [testConstraint pc]}}
+    ConstraintInitializer macOrPc \
+	    {expr {[testConstraint mac] || [testConstraint pc]}}
+    ConstraintInitializer unixOrWin \
+	    {expr {[testConstraint unix] || [testConstraint win]}}
+    ConstraintInitializer macOrWin \
+	    {expr {[testConstraint mac] || [testConstraint win]}}
+    ConstraintInitializer macOrUnix \
+	    {expr {[testConstraint mac] || [testConstraint unix]}}
+
+    ConstraintInitializer nt {string equal $::tcl_platform(os) "Windows NT"}
+    ConstraintInitializer 95 {string equal $::tcl_platform(os) "Windows 95"}
+    ConstraintInitializer 98 {string equal $::tcl_platform(os) "Windows 98"}
+
+    # The following Constraints switches are used to mark tests that
+    # should work, but have been temporarily disabled on certain
+    # platforms because they don't and we haven't gotten around to
+    # fixing the underlying problem.
+
+    ConstraintInitializer tempNotPc {expr {![testConstraint pc]}}
+    ConstraintInitializer tempNotWin {expr {![testConstraint win]}}
+    ConstraintInitializer tempNotMac {expr {![testConstraint mac]}}
+    ConstraintInitializer tempNotUnix {expr {![testConstraint unix]}}
+
+    # The following Constraints switches are used to mark tests that
+    # crash on certain platforms, so that they can be reactivated again
+    # when the underlying problem is fixed.
+
+    ConstraintInitializer pcCrash {expr {![testConstraint pc]}}
+    ConstraintInitializer winCrash {expr {![testConstraint win]}}
+    ConstraintInitializer macCrash {expr {![testConstraint mac]}}
+    ConstraintInitializer unixCrash {expr {![testConstraint unix]}}
+
+    # Skip empty tests
+
+    ConstraintInitializer emptyTest {format 0}
+
+    # By default, tests that expose known bugs are skipped.
+
+    ConstraintInitializer knownBug {format 0}
+
+    # By default, non-portable tests are skipped.
+
+    ConstraintInitializer nonPortable {format 0}
+
+    # Some tests require user interaction.
+
+    ConstraintInitializer userInteraction {format 0}
+
+    # Some tests must be skipped if the interpreter is not in
+    # interactive mode
+
+    ConstraintInitializer interactive \
+	    {expr {[info exists ::tcl_interactive] && $::tcl_interactive}}
+
+    # Some tests can only be run if the installation came from a CD
+    # image instead of a web image.  Some tests must be skipped if you
+    # are running as root on Unix.  Other tests can only be run if you
+    # are running as root on Unix.
+
+    ConstraintInitializer root {expr \
+	    {($::tcl_platform(platform) eq "unix") &&
+		    ($::tcl_platform(user) in {root {}})}}
+    ConstraintInitializer notRoot {expr {![testConstraint root]}}
+
+    # Set nonBlockFiles constraint: 1 means this platform supports
+    # setting files into nonblocking mode.
+
+    ConstraintInitializer nonBlockFiles {
+	    set code [expr {[catch {set f [open defs r]}]
+		    || [catch {chan configure $f -blocking off}]}]
+	    catch {close $f}
+	    set code
+    }
+
+    # Set asyncPipeClose constraint: 1 means this platform supports
+    # async flush and async close on a pipe.
+    #
+    # Test for SCO Unix - cannot run async flushing tests because a
+    # potential problem with select is apparently interfering.
+    # (Mark Diekhans).
+
+    ConstraintInitializer asyncPipeClose {expr {
+	    !([string equal unix $::tcl_platform(platform)]
+	    && ([catch {exec uname -X | fgrep {Release = 3.2v}}] == 0))}}
+
+    # Test to see if we have a broken version of sprintf with respect
+    # to the "e" format of floating-point numbers.
+
+    ConstraintInitializer eformat {string equal [format %g 5e-5] 5e-05}
+
+    # Test to see if execed commands such as cat, echo, rm and so forth
+    # are present on this machine.
+
+    ConstraintInitializer unixExecs {
+	set code 1
+        if {$::tcl_platform(platform) eq "macintosh"} {
+	    set code 0
+        }
+        if {$::tcl_platform(platform) eq "windows"} {
+	    if {[catch {
+	        set file _tcl_test_remove_me.txt
+	        makeFile {hello} $file
+	    }]} {
+	        set code 0
+	    } elseif {
+	        [catch {exec cat $file}] ||
+	        [catch {exec echo hello}] ||
+	        [catch {exec sh -c echo hello}] ||
+	        [catch {exec wc $file}] ||
+	        [catch {exec sleep 1}] ||
+	        [catch {exec echo abc > $file}] ||
+	        [catch {exec chmod 644 $file}] ||
+	        [catch {exec rm $file}] ||
+	        [llength [auto_execok mkdir]] == 0 ||
+	        [llength [auto_execok fgrep]] == 0 ||
+	        [llength [auto_execok grep]] == 0 ||
+	        [llength [auto_execok ps]] == 0
+	    } {
+	        set code 0
+	    }
+	    removeFile $file
+        }
+	set code
+    }
+
+    ConstraintInitializer stdio {
+	set code 0
+	if {![catch {set f [open "|[list [interpreter]]" w]}]} {
+	    if {![catch {puts $f exit}]} {
+		if {![catch {close $f}]} {
+		    set code 1
+		}
+	    }
+	}
+	set code
+    }
+
+    # Deliberately call socket with the wrong number of arguments.  The
+    # error message you get will indicate whether sockets are available
+    # on this system.
+
+    ConstraintInitializer socket {
+	catch {socket} msg
+	string compare $msg "sockets are not available on this system"
+    }
+
+    # Check for internationalization
+    ConstraintInitializer hasIsoLocale {
+	if {[llength [info commands testlocale]] == 0} {
+	    set code 0
+	} else {
+	    set code [string length [SetIso8859_1_Locale]]
+	    RestoreLocale
+	}
+	set code
+    }
+
+}
+#####################################################################
+
+# Usage and command line arguments processing.
+
+# tcltest::PrintUsageInfo
+#
+#	Prints out the usage information for package tcltest.  This can
+#	be customized with the redefinition of [PrintUsageInfoHook].
+#
+# Arguments:
+#	none
+#
+# Results:
+#       none
+#
+# Side Effects:
+#       none
+proc tcltest::PrintUsageInfo {} {
+    puts [Usage]
+    PrintUsageInfoHook
+}
+
+proc tcltest::Usage { {option ""} } {
+    variable Usage
+    variable Verify
+    if {[llength [info level 0]] == 1} {
+	set msg "Usage: [file tail [info nameofexecutable]] script "
+	append msg "?-help? ?flag value? ... \n"
+	append msg "Available flags (and valid input values) are:"
+
+	set max 0
+	set allOpts [concat -help [Configure]]
+	foreach opt $allOpts {
+	    set foo [Usage $opt]
+	    lassign $foo x type($opt) usage($opt)
+	    set line($opt) "  $opt $type($opt)  "
+	    set length($opt) [string length $line($opt)]
+	    if {$length($opt) > $max} {set max $length($opt)}
+	}
+	set rest [expr {72 - $max}]
+	foreach opt $allOpts {
+	    append msg \n$line($opt)
+	    append msg [string repeat " " [expr {$max - $length($opt)}]]
+	    set u [string trim $usage($opt)]
+	    catch {append u "  (default: \[[Configure $opt]])"}
+	    regsub -all {\s*\n\s*} $u " " u
+	    while {[string length $u] > $rest} {
+		set break [string wordstart $u $rest]
+		if {$break == 0} {
+		    set break [string wordend $u 0]
+		}
+		append msg [string range $u 0 [expr {$break - 1}]]
+		set u [string trim [string range $u $break end]]
+		append msg \n[string repeat " " $max]
+	    }
+	    append msg $u
+	}
+	return $msg\n
+    } elseif {$option eq "-help"} {
+	return [list -help "" "Display this usage information."]
+    } else {
+	set type [lindex [info args $Verify($option)] 0]
+	return [list $option $type $Usage($option)]
+    }
+}
+
+# tcltest::ProcessFlags --
+#
+#	process command line arguments supplied in the flagArray - this
+#	is called by processCmdLineArgs.  Modifies tcltest variables
+#	according to the content of the flagArray.
+#
+# Arguments:
+#	flagArray - array containing name/value pairs of flags
+#
+# Results:
+#	sets tcltest variables according to their values as defined by
+#       flagArray
+#
+# Side effects:
+#	None.
+
+proc tcltest::ProcessFlags {flagArray} {
+    # Process -help first
+    if {"-help" in $flagArray} {
+	PrintUsageInfo
+	exit 1
+    }
+
+    if {[llength $flagArray] == 0} {
+	RemoveAutoConfigureTraces
+    } else {
+	set args $flagArray
+	while {[llength $args] > 1 && [catch {configure {*}$args} msg]} {
+
+	    # Something went wrong parsing $args for tcltest options
+	    # Check whether the problem is "unknown option"
+	    if {[regexp {^unknown option (\S+):} $msg -> option]} {
+		# Could be this is an option the Hook knows about
+		set moreOptions [processCmdLineArgsAddFlagsHook]
+		if {$option ni $moreOptions} {
+		    # Nope.  Report the error, including additional options,
+		    # but keep going
+		    if {[llength $moreOptions]} {
+			append msg ", "
+			append msg [join [lrange $moreOptions 0 end-1] ", "]
+			append msg "or [lindex $moreOptions end]"
+		    }
+		    Warn $msg
+		}
+	    } else {
+		# error is something other than "unknown option"
+		# notify user of the error; and exit
+		puts [errorChannel] $msg
+		exit 1
+	    }
+
+	    # To recover, find that unknown option and remove up to it.
+	    # then retry
+	    while {[lindex $args 0] ne $option} {
+		set args [lrange $args 2 end]
+	    }
+	    set args [lrange $args 2 end]
+	}
+	if {[llength $args] == 1} {
+	    puts [errorChannel] \
+		    "missing value for option [lindex $args 0]"
+	    exit 1
+	}
+    }
+
+    # Call the hook
+    catch {
+        array set flag $flagArray
+        processCmdLineArgsHook [array get flag]
+    }
+    return
+}
+
+# tcltest::ProcessCmdLineArgs --
+#
+#       This procedure must be run after constraint initialization is
+#	set up (by [DefineConstraintInitializers]) because some constraints
+#	can be overridden.
+#
+#       Perform configuration according to the command-line options.
+#
+# Arguments:
+#	none
+#
+# Results:
+#	Sets the above-named variables in the tcltest namespace.
+#
+# Side Effects:
+#       None.
+#
+
+proc tcltest::ProcessCmdLineArgs {} {
+    variable originalEnv
+    variable testConstraints
+
+    # The "argv" var doesn't exist in some cases, so use {}.
+    if {![info exists ::argv]} {
+	ProcessFlags {}
+    } else {
+	ProcessFlags $::argv
+    }
+
+    # Spit out everything you know if we're at a debug level 2 or
+    # greater
+    DebugPuts 2 "Flags passed into tcltest:"
+    if {[info exists ::env(TCLTEST_OPTIONS)]} {
+	DebugPuts 2 \
+		"    ::env(TCLTEST_OPTIONS): $::env(TCLTEST_OPTIONS)"
+    }
+    if {[info exists ::argv]} {
+	DebugPuts 2 "    argv: $::argv"
+    }
+    DebugPuts    2 "tcltest::debug              = [debug]"
+    DebugPuts    2 "tcltest::testsDirectory     = [testsDirectory]"
+    DebugPuts    2 "tcltest::workingDirectory   = [workingDirectory]"
+    DebugPuts    2 "tcltest::temporaryDirectory = [temporaryDirectory]"
+    DebugPuts    2 "tcltest::outputChannel      = [outputChannel]"
+    DebugPuts    2 "tcltest::errorChannel       = [errorChannel]"
+    DebugPuts    2 "Original environment (tcltest::originalEnv):"
+    DebugPArray  2 originalEnv
+    DebugPuts    2 "Constraints:"
+    DebugPArray  2 testConstraints
+}
+
+#####################################################################
+
+# Code to run the tests goes here.
+
+# tcltest::TestPuts --
+#
+#	Used to redefine puts in test environment.  Stores whatever goes
+#	out on stdout in tcltest::outData and stderr in errData before
+#	sending it on to the regular puts.
+#
+# Arguments:
+#	same as standard puts
+#
+# Results:
+#	none
+#
+# Side effects:
+#       Intercepts puts; data that would otherwise go to stdout, stderr,
+#	or file channels specified in outputChannel and errorChannel
+#	does not get sent to the normal puts function.
+namespace eval tcltest::Replace {
+    namespace export puts
+}
+proc tcltest::Replace::puts {args} {
+    variable [namespace parent]::outData
+    variable [namespace parent]::errData
+    switch [llength $args] {
+	1 {
+	    # Only the string to be printed is specified
+	    append outData [lindex $args 0]\n
+	    return
+	    # return [Puts [lindex $args 0]]
+	}
+	2 {
+	    # Either -nonewline or channelId has been specified
+	    if {[lindex $args 0] eq "-nonewline"} {
+		append outData [lindex $args end]
+		return
+		# return [Puts -nonewline [lindex $args end]]
+	    } else {
+		set channel [lindex $args 0]
+		set newline \n
+	    }
+	}
+	3 {
+	    if {[lindex $args 0] eq "-nonewline"} {
+		# Both -nonewline and channelId are specified, unless
+		# it's an error.  -nonewline is supposed to be argv[0].
+		set channel [lindex $args 1]
+		set newline ""
+	    }
+	}
+    }
+
+    if {[info exists channel]} {
+	if {$channel in [list [[namespace parent]::outputChannel] stdout]} {
+	    append outData [lindex $args end]$newline
+	    return
+	} elseif {$channel in [list [[namespace parent]::errorChannel] stderr]} {
+	    append errData [lindex $args end]$newline
+	    return
+	}
+    }
+
+    # If we haven't returned by now, we don't know how to handle the
+    # input.  Let puts handle it.
+    return [Puts {*}$args]
+}
+
+# tcltest::Eval --
+#
+#	Evaluate the script in the test environment.  If ignoreOutput is
+#       false, store data sent to stderr and stdout in outData and
+#       errData.  Otherwise, ignore this output altogether.
+#
+# Arguments:
+#	script             Script to evaluate
+#       ?ignoreOutput?     Indicates whether or not to ignore output
+#			   sent to stdout & stderr
+#
+# Results:
+#	result from running the script
+#
+# Side effects:
+#	Empties the contents of outData and errData before running a
+#	test if ignoreOutput is set to 0.
+
+proc tcltest::Eval {script {ignoreOutput 1}} {
+    variable outData
+    variable errData
+    DebugPuts 3 "[lindex [info level 0] 0] called"
+    if {!$ignoreOutput} {
+	set outData {}
+	set errData {}
+	rename ::puts [namespace current]::Replace::Puts
+	namespace eval :: [list namespace import [namespace origin Replace::puts]]
+	namespace import Replace::puts
+    }
+    set result [uplevel 1 $script]
+    if {!$ignoreOutput} {
+	namespace forget puts
+	namespace eval :: namespace forget puts
+	rename [namespace current]::Replace::Puts ::puts
+    }
+    return $result
+}
+
+# tcltest::CompareStrings --
+#
+#	compares the expected answer to the actual answer, depending on
+#	the mode provided.  Mode determines whether a regexp, exact,
+#	glob or custom comparison is done.
+#
+# Arguments:
+#	actual - string containing the actual result
+#       expected - pattern to be matched against
+#       mode - type of comparison to be done
+#
+# Results:
+#	result of the match
+#
+# Side effects:
+#	None.
+
+proc tcltest::CompareStrings {actual expected mode} {
+    variable CustomMatch
+    if {![info exists CustomMatch($mode)]} {
+        return -code error "No matching command registered for `-match $mode'"
+    }
+    set match [namespace eval :: $CustomMatch($mode) [list $expected $actual]]
+    if {[catch {expr {$match && $match}} result]} {
+	return -code error "Invalid result from `-match $mode' command: $result"
+    }
+    return $match
+}
+
+# tcltest::customMatch --
+#
+#	registers a command to be called when a particular type of
+#	matching is required.
+#
+# Arguments:
+#	nickname - Keyword for the type of matching
+#	cmd - Incomplete command that implements that type of matching
+#		when completed with expected string and actual string
+#		and then evaluated.
+#
+# Results:
+#	None.
+#
+# Side effects:
+#	Sets the variable tcltest::CustomMatch
+
+proc tcltest::customMatch {mode script} {
+    variable CustomMatch
+    if {![info complete $script]} {
+	return -code error \
+		"invalid customMatch script; can't evaluate after completion"
+    }
+    set CustomMatch($mode) $script
+}
+
+# tcltest::SubstArguments list
+#
+# This helper function takes in a list of words, then perform a
+# substitution on the list as though each word in the list is a separate
+# argument to the Tcl function.  For example, if this function is
+# invoked as:
+#
+#      SubstArguments {$a {$a}}
+#
+# Then it is as though the function is invoked as:
+#
+#      SubstArguments $a {$a}
+#
+# This code is adapted from Paul Duffin's function "SplitIntoWords".
+# The original function can be found  on:
+#
+#      http://purl.org/thecliff/tcl/wiki/858.html
+#
+# Results:
+#     a list containing the result of the substitution
+#
+# Exceptions:
+#     An error may occur if the list containing unbalanced quote or
+#     unknown variable.
+#
+# Side Effects:
+#     None.
+#
+
+proc tcltest::SubstArguments {argList} {
+
+    # We need to split the argList up into tokens but cannot use list
+    # operations as they throw away some significant quoting, and
+    # [split] ignores braces as it should.  Therefore what we do is
+    # gradually build up a string out of whitespace seperated strings.
+    # We cannot use [split] to split the argList into whitespace
+    # separated strings as it throws away the whitespace which maybe
+    # important so we have to do it all by hand.
+
+    set result {}
+    set token ""
+
+    while {[string length $argList]} {
+        # Look for the next word containing a quote: " { }
+        if {[regexp -indices {[^ \t\n]*[\"\{\}]+[^ \t\n]*} \
+		$argList all]} {
+            # Get the text leading up to this word, but not including
+	    # this word, from the argList.
+            set text [string range $argList 0 \
+		    [expr {[lindex $all 0] - 1}]]
+            # Get the word with the quote
+            set word [string range $argList \
+                    [lindex $all 0] [lindex $all 1]]
+
+            # Remove all text up to and including the word from the
+            # argList.
+            set argList [string range $argList \
+                    [expr {[lindex $all 1] + 1}] end]
+        } else {
+            # Take everything up to the end of the argList.
+            set text $argList
+            set word {}
+            set argList {}
+        }
+
+        if {$token ne {}} {
+            # If we saw a word with quote before, then there is a
+            # multi-word token starting with that word.  In this case,
+            # add the text and the current word to this token.
+            append token $text $word
+        } else {
+            # Add the text to the result.  There is no need to parse
+            # the text because it couldn't be a part of any multi-word
+            # token.  Then start a new multi-word token with the word
+            # because we need to pass this token to the Tcl parser to
+            # check for balancing quotes
+            append result $text
+            set token $word
+        }
+
+        if { [catch {llength $token} length] == 0 && $length == 1} {
+            # The token is a valid list so add it to the result.
+            # lappend result [string trim $token]
+            append result \{$token\}
+            set token {}
+        }
+    }
+
+    # If the last token has not been added to the list then there
+    # is a problem.
+    if { [string length $token] } {
+        error "incomplete token \"$token\""
+    }
+
+    return $result
+}
+
+
+# tcltest::test --
+#
+# This procedure runs a test and prints an error message if the test
+# fails.  If verbose has been set, it also prints a message even if the
+# test succeeds.  The test will be skipped if it doesn't match the
+# match variable, if it matches an element in skip, or if one of the
+# elements of "constraints" turns out not to be true.
+#
+# If testLevel is 1, then this is a top level test, and we record
+# pass/fail information; otherwise, this information is not logged and
+# is not added to running totals.
+#
+# Attributes:
+#   Only description is a required attribute.  All others are optional.
+#   Default values are indicated.
+#
+#   constraints -	A list of one or more keywords, each of which
+#			must be the name of an element in the array
+#			"testConstraints".  If any of these elements is
+#			zero, the test is skipped. This attribute is
+#			optional; default is {}
+#   body -	        Script to run to carry out the test.  It must
+#		        return a result that can be checked for
+#		        correctness.  This attribute is optional;
+#                       default is {}
+#   result -	        Expected result from script.  This attribute is
+#                       optional; default is {}.
+#   output -            Expected output sent to stdout.  This attribute
+#                       is optional; default is {}.
+#   errorOutput -       Expected output sent to stderr.  This attribute
+#                       is optional; default is {}.
+#   returnCodes -       Expected return codes.  This attribute is
+#                       optional; default is {0 2}.
+#   setup -             Code to run before $script (above).  This
+#                       attribute is optional; default is {}.
+#   cleanup -           Code to run after $script (above).  This
+#                       attribute is optional; default is {}.
+#   match -             specifies type of matching to do on result,
+#                       output, errorOutput; this must be a string
+#			previously registered by a call to [customMatch].
+#			The strings exact, glob, and regexp are pre-registered
+#			by the tcltest package.  Default value is exact.
+#
+# Arguments:
+#   name -		Name of test, in the form foo-1.2.
+#   description -	Short textual description of the test, to
+#  		  	help humans understand what it does.
+#
+# Results:
+#	None.
+#
+# Side effects:
+#       Just about anything is possible depending on the test.
+#
+
+proc tcltest::test {name description args} {
+    global tcl_platform
+    variable testLevel
+    variable coreModTime
+    DebugPuts 3 "test $name $args"
+    DebugDo 1 {
+	variable TestNames
+	catch {
+	    puts "test name '$name' re-used; prior use in $TestNames($name)"
+	}
+	set TestNames($name) [info script]
+    }
+
+    FillFilesExisted
+    incr testLevel
+
+    # Pre-define everything to null except output and errorOutput.  We
+    # determine whether or not to trap output based on whether or not
+    # these variables (output & errorOutput) are defined.
+    lassign {} constraints setup cleanup body result returnCodes match
+
+    # Set the default match mode
+    set match exact
+
+    # Set the default match values for return codes (0 is the standard
+    # expected return value if everything went well; 2 represents
+    # 'return' being used in the test script).
+    set returnCodes [list 0 2]
+
+    # The old test format can't have a 3rd argument (constraints or
+    # script) that starts with '-'.
+    if {[string match -* [lindex $args 0]] || ([llength $args] <= 1)} {
+	if {[llength $args] == 1} {
+	    set list [SubstArguments [lindex $args 0]]
+	    foreach {element value} $list {
+		set testAttributes($element) $value
+	    }
+	    foreach item {constraints match setup body cleanup \
+		    result returnCodes output errorOutput} {
+		if {[info exists testAttributes(-$item)]} {
+		    set testAttributes(-$item) [uplevel 1 \
+			    ::concat $testAttributes(-$item)]
+		}
+	    }
+	} else {
+	    array set testAttributes $args
+	}
+
+	set validFlags {-setup -cleanup -body -result -returnCodes \
+		-match -output -errorOutput -constraints}
+
+	foreach flag [array names testAttributes] {
+	    if {$flag ni $validFlags} {
+		incr testLevel -1
+		set sorted [lsort $validFlags]
+		set options [join [lrange $sorted 0 end-1] ", "]
+		append options ", or [lindex $sorted end]"
+		return -code error "bad option \"$flag\": must be $options"
+	    }
+	}
+
+	# store whatever the user gave us
+	foreach item [array names testAttributes] {
+	    set [string trimleft $item "-"] $testAttributes($item)
+	}
+
+	# Check the values supplied for -match
+	variable CustomMatch
+	if {$match ni [array names CustomMatch]} {
+	    incr testLevel -1
+	    set sorted [lsort [array names CustomMatch]]
+	    set values [join [lrange $sorted 0 end-1] ", "]
+	    append values ", or [lindex $sorted end]"
+	    return -code error "bad -match value \"$match\":\
+		    must be $values"
+	}
+
+	# Replace symbolic valies supplied for -returnCodes
+	foreach {strcode numcode} {ok 0 normal 0 error 1 return 2 break 3 continue 4} {
+	    set returnCodes [string map -nocase [list $strcode $numcode] $returnCodes]
+	}
+    } else {
+	# This is parsing for the old test command format; it is here
+	# for backward compatibility.
+	set result [lindex $args end]
+	if {[llength $args] == 2} {
+	    set body [lindex $args 0]
+	} elseif {[llength $args] == 3} {
+	    set constraints [lindex $args 0]
+	    set body [lindex $args 1]
+	} else {
+	    incr testLevel -1
+	    return -code error "wrong # args:\
+		    should be \"test name desc ?options?\""
+	}
+    }
+
+    if {[Skipped $name $constraints]} {
+	incr testLevel -1
+	return
+    }
+
+    # Save information about the core file.
+    if {[preserveCore]} {
+	if {[file exists [file join [workingDirectory] core]]} {
+	    set coreModTime [file mtime [file join [workingDirectory] core]]
+	}
+    }
+
+    # First, run the setup script
+    set code [catch {uplevel 1 $setup} setupMsg]
+    if {$code == 1} {
+	set errorInfo(setup) $::errorInfo
+	set errorCode(setup) $::errorCode
+    }
+    set setupFailure [expr {$code != 0}]
+
+    # Only run the test body if the setup was successful
+    if {!$setupFailure} {
+
+	# Register startup time
+	if {[IsVerbose msec] || [IsVerbose usec]} {
+	    set timeStart [clock microseconds]
+	}
+
+	# Verbose notification of $body start
+	if {[IsVerbose start]} {
+	    puts [outputChannel] "---- $name start"
+	    flush [outputChannel]
+	}
+
+	set command [list [namespace origin RunTest] $name $body]
+	if {[info exists output] || [info exists errorOutput]} {
+	    set testResult [uplevel 1 [list [namespace origin Eval] $command 0]]
+	} else {
+	    set testResult [uplevel 1 [list [namespace origin Eval] $command 1]]
+	}
+	lassign $testResult actualAnswer returnCode
+	if {$returnCode == 1} {
+	    set errorInfo(body) $::errorInfo
+	    set errorCode(body) $::errorCode
+	}
+    }
+
+    # check if the return code matched the expected return code
+    set codeFailure 0
+    if {!$setupFailure && ($returnCode ni $returnCodes)} {
+	set codeFailure 1
+    }
+
+    # If expected output/error strings exist, we have to compare
+    # them.  If the comparison fails, then so did the test.
+    set outputFailure 0
+    variable outData
+    if {[info exists output] && !$codeFailure} {
+	if {[set outputCompare [catch {
+	    CompareStrings $outData $output $match
+	} outputMatch]] == 0} {
+	    set outputFailure [expr {!$outputMatch}]
+	} else {
+	    set outputFailure 1
+	}
+    }
+
+    set errorFailure 0
+    variable errData
+    if {[info exists errorOutput] && !$codeFailure} {
+	if {[set errorCompare [catch {
+	    CompareStrings $errData $errorOutput $match
+	} errorMatch]] == 0} {
+	    set errorFailure [expr {!$errorMatch}]
+	} else {
+	    set errorFailure 1
+	}
+    }
+
+    # check if the answer matched the expected answer
+    # Only check if we ran the body of the test (no setup failure)
+    if {$setupFailure || $codeFailure} {
+	set scriptFailure 0
+    } elseif {[set scriptCompare [catch {
+	CompareStrings $actualAnswer $result $match
+    } scriptMatch]] == 0} {
+	set scriptFailure [expr {!$scriptMatch}]
+    } else {
+	set scriptFailure 1
+    }
+
+    # Always run the cleanup script
+    set code [catch {uplevel 1 $cleanup} cleanupMsg]
+    if {$code == 1} {
+	set errorInfo(cleanup) $::errorInfo
+	set errorCode(cleanup) $::errorCode
+    }
+    set cleanupFailure [expr {$code != 0}]
+
+    set coreFailure 0
+    set coreMsg ""
+    # check for a core file first - if one was created by the test,
+    # then the test failed
+    if {[preserveCore]} {
+	if {[file exists [file join [workingDirectory] core]]} {
+	    # There's only a test failure if there is a core file
+	    # and (1) there previously wasn't one or (2) the new
+	    # one is different from the old one.
+	    if {[info exists coreModTime]} {
+		if {$coreModTime != [file mtime \
+			[file join [workingDirectory] core]]} {
+		    set coreFailure 1
+		}
+	    } else {
+		set coreFailure 1
+	    }
+
+	    if {([preserveCore] > 1) && ($coreFailure)} {
+		append coreMsg "\nMoving file to:\
+		    [file join [temporaryDirectory] core-$name]"
+		catch {file rename -force -- \
+		    [file join [workingDirectory] core] \
+		    [file join [temporaryDirectory] core-$name]
+		} msg
+		if {$msg ne {}} {
+		    append coreMsg "\nError:\
+			Problem renaming core file: $msg"
+		}
+	    }
+	}
+    }
+
+    if {[IsVerbose msec] || [IsVerbose usec]} {
+	set t [expr {[clock microseconds] - $timeStart}]
+	if {[IsVerbose usec]} {
+	    puts [outputChannel] "++++ $name took $t μs"
+	}
+	if {[IsVerbose msec]} {
+	    puts [outputChannel] "++++ $name took [expr {round($t/1000.)}] ms"
+	}
+    }
+
+    # if we didn't experience any failures, then we passed
+    variable numTests
+    if {!($setupFailure || $cleanupFailure || $coreFailure
+	    || $outputFailure || $errorFailure || $codeFailure
+	    || $scriptFailure)} {
+	if {$testLevel == 1} {
+	    incr numTests(Passed)
+	    if {[IsVerbose pass]} {
+		puts [outputChannel] "++++ $name PASSED"
+	    }
+	}
+	incr testLevel -1
+	return
+    }
+
+    # We know the test failed, tally it...
+    if {$testLevel == 1} {
+	incr numTests(Failed)
+    }
+
+    # ... then report according to the type of failure
+    variable currentFailure true
+    if {![IsVerbose body]} {
+	set body ""
+    }
+    puts [outputChannel] "\n"
+    if {[IsVerbose line]} {
+	if {![catch {set testFrame [info frame -1]}] &&
+		[dict get $testFrame type] eq "source"} {
+	    set testFile [dict get $testFrame file]
+	    set testLine [dict get $testFrame line]
+	} else {
+	    set testFile [file normalize [uplevel 1 {info script}]]
+	    if {[file readable $testFile]} {
+		set testFd [open $testFile r]
+		set testLine [expr {[lsearch -regexp \
+			[split [read $testFd] "\n"] \
+			"^\[ \t\]*test [string map {. \\.} $name] "] + 1}]
+		close $testFd
+	    }
+	}
+	if {[info exists testLine]} {
+	    puts [outputChannel] "$testFile:$testLine: error: test failed:\
+		    $name [string trim $description]"
+	}
+    }
+    puts [outputChannel] "==== $name\
+	    [string trim $description] FAILED"
+    if {[string length $body]} {
+	puts [outputChannel] "==== Contents of test case:"
+	puts [outputChannel] $body
+    }
+    if {$setupFailure} {
+	puts [outputChannel] "---- Test setup\
+		failed:\n$setupMsg"
+	if {[info exists errorInfo(setup)]} {
+	    puts [outputChannel] "---- errorInfo(setup): $errorInfo(setup)"
+	    puts [outputChannel] "---- errorCode(setup): $errorCode(setup)"
+	}
+    }
+    if {$scriptFailure} {
+	if {$scriptCompare} {
+	    puts [outputChannel] "---- Error testing result: $scriptMatch"
+	} else {
+	    puts [outputChannel] "---- Result was:\n$actualAnswer"
+	    puts [outputChannel] "---- Result should have been\
+		    ($match matching):\n$result"
+	}
+    }
+    if {$codeFailure} {
+	switch -- $returnCode {
+	    0 { set msg "Test completed normally" }
+	    1 { set msg "Test generated error" }
+	    2 { set msg "Test generated return exception" }
+	    3 { set msg "Test generated break exception" }
+	    4 { set msg "Test generated continue exception" }
+	    default { set msg "Test generated exception" }
+	}
+	puts [outputChannel] "---- $msg; Return code was: $returnCode"
+	puts [outputChannel] "---- Return code should have been\
+		one of: $returnCodes"
+	if {[IsVerbose error]} {
+	    if {[info exists errorInfo(body)] && (1 ni $returnCodes)} {
+		puts [outputChannel] "---- errorInfo: $errorInfo(body)"
+		puts [outputChannel] "---- errorCode: $errorCode(body)"
+	    }
+	}
+    }
+    if {$outputFailure} {
+	if {$outputCompare} {
+	    puts [outputChannel] "---- Error testing output: $outputMatch"
+	} else {
+	    puts [outputChannel] "---- Output was:\n$outData"
+	    puts [outputChannel] "---- Output should have been\
+		    ($match matching):\n$output"
+	}
+    }
+    if {$errorFailure} {
+	if {$errorCompare} {
+	    puts [outputChannel] "---- Error testing errorOutput: $errorMatch"
+	} else {
+	    puts [outputChannel] "---- Error output was:\n$errData"
+	    puts [outputChannel] "---- Error output should have\
+		    been ($match matching):\n$errorOutput"
+	}
+    }
+    if {$cleanupFailure} {
+	puts [outputChannel] "---- Test cleanup failed:\n$cleanupMsg"
+	if {[info exists errorInfo(cleanup)]} {
+	    puts [outputChannel] "---- errorInfo(cleanup): $errorInfo(cleanup)"
+	    puts [outputChannel] "---- errorCode(cleanup): $errorCode(cleanup)"
+	}
+    }
+    if {$coreFailure} {
+	puts [outputChannel] "---- Core file produced while running\
+		test!  $coreMsg"
+    }
+    puts [outputChannel] "==== $name FAILED\n"
+
+    incr testLevel -1
+    return
+}
+
+# Skipped --
+#
+# Given a test name and it constraints, returns a boolean indicating
+# whether the current configuration says the test should be skipped.
+#
+# Side Effects:  Maintains tally of total tests seen and tests skipped.
+#
+proc tcltest::Skipped {name constraints} {
+    variable testLevel
+    variable numTests
+    variable testConstraints
+
+    if {$testLevel == 1} {
+	incr numTests(Total)
+    }
+    # skip the test if it's name matches an element of skip
+    foreach pattern [skip] {
+	if {[string match $pattern $name]} {
+	    if {$testLevel == 1} {
+		incr numTests(Skipped)
+		DebugDo 1 {AddToSkippedBecause userSpecifiedSkip}
+	    }
+	    return 1
+	}
+    }
+    # skip the test if it's name doesn't match any element of match
+    set ok 0
+    foreach pattern [match] {
+	if {[string match $pattern $name]} {
+	    set ok 1
+	    break
+	}
+    }
+    if {!$ok} {
+	if {$testLevel == 1} {
+	    incr numTests(Skipped)
+	    DebugDo 1 {AddToSkippedBecause userSpecifiedNonMatch}
+	}
+	return 1
+    }
+    if {$constraints eq {}} {
+	# If we're limited to the listed constraints and there aren't
+	# any listed, then we shouldn't run the test.
+	if {[limitConstraints]} {
+	    AddToSkippedBecause userSpecifiedLimitConstraint
+	    if {$testLevel == 1} {
+		incr numTests(Skipped)
+	    }
+	    return 1
+	}
+    } else {
+	# "constraints" argument exists;
+	# make sure that the constraints are satisfied.
+
+	set doTest 0
+	if {[string match {*[$\[]*} $constraints] != 0} {
+	    # full expression, e.g. {$foo > [info tclversion]}
+	    catch {set doTest [uplevel #0 [list expr $constraints]]}
+	} elseif {[regexp {[^.:_a-zA-Z0-9 \n\r\t]+} $constraints] != 0} {
+	    # something like {a || b} should be turned into
+	    # $testConstraints(a) || $testConstraints(b).
+	    regsub -all {[.\w]+} $constraints {$testConstraints(&)} c
+	    catch {set doTest [eval [list expr $c]]}
+	} elseif {![catch {llength $constraints}]} {
+	    # just simple constraints such as {unixOnly fonts}.
+	    set doTest 1
+	    foreach constraint $constraints {
+		if {(![info exists testConstraints($constraint)]) \
+			|| (!$testConstraints($constraint))} {
+		    set doTest 0
+
+		    # store the constraint that kept the test from
+		    # running
+		    set constraints $constraint
+		    break
+		}
+	    }
+	}
+
+	if {!$doTest} {
+	    if {[IsVerbose skip]} {
+		puts [outputChannel] "++++ $name SKIPPED: $constraints"
+	    }
+
+	    if {$testLevel == 1} {
+		incr numTests(Skipped)
+		AddToSkippedBecause $constraints
+	    }
+	    return 1
+	}
+    }
+    return 0
+}
+
+# RunTest --
+#
+# This is where the body of a test is evaluated.  The combination of
+# [RunTest] and [Eval] allows the output and error output of the test
+# body to be captured for comparison against the expected values.
+
+proc tcltest::RunTest {name script} {
+    DebugPuts 3 "Running $name {$script}"
+
+    # If there is no "memory" command (because memory debugging isn't
+    # enabled), then don't attempt to use the command.
+
+    if {[llength [info commands memory]] == 1} {
+	memory tag $name
+    }
+
+    set code [catch {uplevel 1 $script} actualAnswer]
+
+    return [list $actualAnswer $code]
+}
+
+#####################################################################
+
+# tcltest::cleanupTestsHook --
+#
+#	This hook allows a harness that builds upon tcltest to specify
+#       additional things that should be done at cleanup.
+#
+
+if {[llength [info commands tcltest::cleanupTestsHook]] == 0} {
+    proc tcltest::cleanupTestsHook {} {}
+}
+
+# tcltest::cleanupTests --
+#
+# Remove files and dirs created using the makeFile and makeDirectory
+# commands since the last time this proc was invoked.
+#
+# Print the names of the files created without the makeFile command
+# since the tests were invoked.
+#
+# Print the number tests (total, passed, failed, and skipped) since the
+# tests were invoked.
+#
+# Restore original environment (as reported by special variable env).
+#
+# Arguments:
+#      calledFromAllFile - if 0, behave as if we are running a single
+#      test file within an entire suite of tests.  if we aren't running
+#      a single test file, then don't report status.  check for new
+#      files created during the test run and report on them.  if 1,
+#      report collated status from all the test file runs.
+#
+# Results:
+#      None.
+#
+# Side Effects:
+#      None
+#
+
+proc tcltest::cleanupTests {{calledFromAllFile 0}} {
+    variable filesMade
+    variable filesExisted
+    variable createdNewFiles
+    variable testSingleFile
+    variable numTests
+    variable numTestFiles
+    variable failFiles
+    variable skippedBecause
+    variable currentFailure
+    variable originalEnv
+    variable originalTclPlatform
+    variable coreModTime
+
+    FillFilesExisted
+    set testFileName [file tail [info script]]
+
+    # Hook to handle reporting to a parent interpreter
+    if {[llength [info commands [namespace current]::ReportToMaster]]} {
+	ReportToMaster $numTests(Total) $numTests(Passed) $numTests(Skipped) \
+	    $numTests(Failed) [array get skippedBecause] \
+	    [array get createdNewFiles]
+	set testSingleFile false
+    }
+
+    # Call the cleanup hook
+    cleanupTestsHook
+
+    # Remove files and directories created by the makeFile and
+    # makeDirectory procedures.  Record the names of files in
+    # workingDirectory that were not pre-existing, and associate them
+    # with the test file that created them.
+
+    if {!$calledFromAllFile} {
+	foreach file $filesMade {
+	    if {[file exists $file]} {
+		DebugDo 1 {Warn "cleanupTests deleting $file..."}
+		catch {file delete -force -- $file}
+	    }
+	}
+	set currentFiles {}
+	foreach file [glob -nocomplain \
+		-directory [temporaryDirectory] *] {
+	    lappend currentFiles [file tail $file]
+	}
+	set newFiles {}
+	foreach file $currentFiles {
+	    if {$file ni $filesExisted} {
+		lappend newFiles $file
+	    }
+	}
+	set filesExisted $currentFiles
+	if {[llength $newFiles] > 0} {
+	    set createdNewFiles($testFileName) $newFiles
+	}
+    }
+
+    if {$calledFromAllFile || $testSingleFile} {
+
+	# print stats
+
+	puts -nonewline [outputChannel] "$testFileName:"
+	foreach index [list "Total" "Passed" "Skipped" "Failed"] {
+	    puts -nonewline [outputChannel] \
+		    "\t$index\t$numTests($index)"
+	}
+	puts [outputChannel] ""
+
+	# print number test files sourced
+	# print names of files that ran tests which failed
+
+	if {$calledFromAllFile} {
+	    puts [outputChannel] \
+		    "Sourced $numTestFiles Test Files."
+	    set numTestFiles 0
+	    if {[llength $failFiles] > 0} {
+		puts [outputChannel] \
+			"Files with failing tests: $failFiles"
+		set failFiles {}
+	    }
+	}
+
+	# if any tests were skipped, print the constraints that kept
+	# them from running.
+
+	set constraintList [array names skippedBecause]
+	if {[llength $constraintList] > 0} {
+	    puts [outputChannel] \
+		    "Number of tests skipped for each constraint:"
+	    foreach constraint [lsort $constraintList] {
+		puts [outputChannel] \
+			"\t$skippedBecause($constraint)\t$constraint"
+		unset skippedBecause($constraint)
+	    }
+	}
+
+	# report the names of test files in createdNewFiles, and reset
+	# the array to be empty.
+
+	set testFilesThatTurded [lsort [array names createdNewFiles]]
+	if {[llength $testFilesThatTurded] > 0} {
+	    puts [outputChannel] "Warning: files left behind:"
+	    foreach testFile $testFilesThatTurded {
+		puts [outputChannel] \
+			"\t$testFile:\t$createdNewFiles($testFile)"
+		unset createdNewFiles($testFile)
+	    }
+	}
+
+	# reset filesMade, filesExisted, and numTests
+
+	set filesMade {}
+	foreach index [list "Total" "Passed" "Skipped" "Failed"] {
+	    set numTests($index) 0
+	}
+
+	# exit only if running Tk in non-interactive mode
+	# This should be changed to determine if an event
+	# loop is running, which is the real issue.
+	# Actually, this doesn't belong here at all.  A package
+	# really has no business [exit]-ing an application.
+	if {![catch {package present Tk}] && ![testConstraint interactive]} {
+	    exit
+	}
+    } else {
+
+	# if we're deferring stat-reporting until all files are sourced,
+	# then add current file to failFile list if any tests in this
+	# file failed
+
+	if {$currentFailure && ($testFileName ni $failFiles)} {
+	    lappend failFiles $testFileName
+	}
+	set currentFailure false
+
+	# restore the environment to the state it was in before this package
+	# was loaded
+
+	set newEnv {}
+	set changedEnv {}
+	set removedEnv {}
+	foreach index [array names ::env] {
+	    if {![info exists originalEnv($index)]} {
+		lappend newEnv $index
+		unset ::env($index)
+	    }
+	}
+	foreach index [array names originalEnv] {
+	    if {![info exists ::env($index)]} {
+		lappend removedEnv $index
+		set ::env($index) $originalEnv($index)
+	    } elseif {$::env($index) ne $originalEnv($index)} {
+		lappend changedEnv $index
+		set ::env($index) $originalEnv($index)
+	    }
+	}
+	if {[llength $newEnv] > 0} {
+	    puts [outputChannel] \
+		    "env array elements created:\t$newEnv"
+	}
+	if {[llength $changedEnv] > 0} {
+	    puts [outputChannel] \
+		    "env array elements changed:\t$changedEnv"
+	}
+	if {[llength $removedEnv] > 0} {
+	    puts [outputChannel] \
+		    "env array elements removed:\t$removedEnv"
+	}
+
+	set changedTclPlatform {}
+	foreach index [array names originalTclPlatform] {
+	    if {$::tcl_platform($index) \
+		    != $originalTclPlatform($index)} {
+		lappend changedTclPlatform $index
+		set ::tcl_platform($index) $originalTclPlatform($index)
+	    }
+	}
+	if {[llength $changedTclPlatform] > 0} {
+	    puts [outputChannel] "tcl_platform array elements\
+		    changed:\t$changedTclPlatform"
+	}
+
+	if {[file exists [file join [workingDirectory] core]]} {
+	    if {[preserveCore] > 1} {
+		puts "rename core file (> 1)"
+		puts [outputChannel] "produced core file! \
+			Moving file to: \
+			[file join [temporaryDirectory] core-$testFileName]"
+		catch {file rename -force -- \
+			[file join [workingDirectory] core] \
+			[file join [temporaryDirectory] core-$testFileName]
+		} msg
+		if {$msg ne {}} {
+		    PrintError "Problem renaming file: $msg"
+		}
+	    } else {
+		# Print a message if there is a core file and (1) there
+		# previously wasn't one or (2) the new one is different
+		# from the old one.
+
+		if {[info exists coreModTime]} {
+		    if {$coreModTime != [file mtime \
+			    [file join [workingDirectory] core]]} {
+			puts [outputChannel] "A core file was created!"
+		    }
+		} else {
+		    puts [outputChannel] "A core file was created!"
+		}
+	    }
+	}
+    }
+    flush [outputChannel]
+    flush [errorChannel]
+    return
+}
+
+#####################################################################
+
+# Procs that determine which tests/test files to run
+
+# tcltest::GetMatchingFiles
+#
+#       Looks at the patterns given to match and skip files and uses
+#	them to put together a list of the tests that will be run.
+#
+# Arguments:
+#       directory to search
+#
+# Results:
+#       The constructed list is returned to the user.  This will
+#	primarily be used in 'all.tcl' files.  It is used in
+#	runAllTests.
+#
+# Side Effects:
+#       None
+
+# a lower case version is needed for compatibility with tcltest 1.0
+proc tcltest::getMatchingFiles args {GetMatchingFiles {*}$args}
+
+proc tcltest::GetMatchingFiles { args } {
+    if {[llength $args]} {
+	set dirList $args
+    } else {
+	# Finding tests only in [testsDirectory] is normal operation.
+	# This procedure is written to accept multiple directory arguments
+	# only to satisfy version 1 compatibility.
+	set dirList [list [testsDirectory]]
+    }
+
+    set matchingFiles [list]
+    foreach directory $dirList {
+
+	# List files in $directory that match patterns to run.
+	set matchFileList [list]
+	foreach match [matchFiles] {
+	    set matchFileList [concat $matchFileList \
+		    [glob -directory $directory -types {b c f p s} \
+		    -nocomplain -- $match]]
+	}
+
+	# List files in $directory that match patterns to skip.
+	set skipFileList [list]
+	foreach skip [skipFiles] {
+	    set skipFileList [concat $skipFileList \
+		    [glob -directory $directory -types {b c f p s} \
+		    -nocomplain -- $skip]]
+	}
+
+	# Add to result list all files in match list and not in skip list
+	foreach file $matchFileList {
+	    if {$file ni $skipFileList} {
+		lappend matchingFiles $file
+	    }
+	}
+    }
+
+    if {[llength $matchingFiles] == 0} {
+	PrintError "No test files remain after applying your match and\
+		skip patterns!"
+    }
+    return $matchingFiles
+}
+
+# tcltest::GetMatchingDirectories --
+#
+#	Looks at the patterns given to match and skip directories and
+#	uses them to put together a list of the test directories that we
+#	should attempt to run.  (Only subdirectories containing an
+#	"all.tcl" file are put into the list.)
+#
+# Arguments:
+#	root directory from which to search
+#
+# Results:
+#	The constructed list is returned to the user.  This is used in
+#	the primary all.tcl file.
+#
+# Side Effects:
+#       None.
+
+proc tcltest::GetMatchingDirectories {rootdir} {
+
+    # Determine the skip list first, to avoid [glob]-ing over subdirectories
+    # we're going to throw away anyway.  Be sure we skip the $rootdir if it
+    # comes up to avoid infinite loops.
+    set skipDirs [list $rootdir]
+    foreach pattern [skipDirectories] {
+	set skipDirs [concat $skipDirs [glob -directory $rootdir -types d \
+		-nocomplain -- $pattern]]
+    }
+
+    # Now step through the matching directories, prune out the skipped ones
+    # as you go.
+    set matchDirs [list]
+    foreach pattern [matchDirectories] {
+	foreach path [glob -directory $rootdir -types d -nocomplain -- \
+		$pattern] {
+	    if {$path ni $skipDirs} {
+		set matchDirs [concat $matchDirs [GetMatchingDirectories $path]]
+		if {[file exists [file join $path all.tcl]]} {
+		    lappend matchDirs $path
+		}
+	    }
+	}
+    }
+
+    if {[llength $matchDirs] == 0} {
+	DebugPuts 1 "No test directories remain after applying match\
+		and skip patterns!"
+    }
+    return [lsort $matchDirs]
+}
+
+# tcltest::runAllTests --
+#
+#	prints output and sources test files according to the match and
+#	skip patterns provided.  after sourcing test files, it goes on
+#	to source all.tcl files in matching test subdirectories.
+#
+# Arguments:
+#	shell being tested
+#
+# Results:
+#	None.
+#
+# Side effects:
+#	None.
+
+proc tcltest::runAllTests { {shell ""} } {
+    variable testSingleFile
+    variable numTestFiles
+    variable numTests
+    variable failFiles
+    variable DefaultValue
+
+    FillFilesExisted
+    if {[llength [info level 0]] == 1} {
+	set shell [interpreter]
+    }
+
+    set testSingleFile false
+
+    puts [outputChannel] "Tests running in interp:  $shell"
+    puts [outputChannel] "Tests located in:  [testsDirectory]"
+    puts [outputChannel] "Tests running in:  [workingDirectory]"
+    puts [outputChannel] "Temporary files stored in\
+	    [temporaryDirectory]"
+
+    # [file system] first available in Tcl 8.4
+    if {![catch {file system [testsDirectory]} result]
+	    && ([lindex $result 0] ne "native")} {
+	# If we aren't running in the native filesystem, then we must
+	# run the tests in a single process (via 'source'), because
+	# trying to run then via a pipe will fail since the files don't
+	# really exist.
+	singleProcess 1
+    }
+
+    if {[singleProcess]} {
+	puts [outputChannel] \
+		"Test files sourced into current interpreter"
+    } else {
+	puts [outputChannel] \
+		"Test files run in separate interpreters"
+    }
+    if {[llength [skip]] > 0} {
+	puts [outputChannel] "Skipping tests that match:  [skip]"
+    }
+    puts [outputChannel] "Running tests that match:  [match]"
+
+    if {[llength [skipFiles]] > 0} {
+	puts [outputChannel] \
+		"Skipping test files that match:  [skipFiles]"
+    }
+    if {[llength [matchFiles]] > 0} {
+	puts [outputChannel] \
+		"Only running test files that match:  [matchFiles]"
+    }
+
+    set timeCmd {clock format [clock seconds]}
+    puts [outputChannel] "Tests began at [eval $timeCmd]"
+
+    # Run each of the specified tests
+    foreach file [lsort [GetMatchingFiles]] {
+	set tail [file tail $file]
+	puts [outputChannel] $tail
+	flush [outputChannel]
+
+	if {[singleProcess]} {
+	    incr numTestFiles
+	    uplevel 1 [list ::source $file]
+	} else {
+	    # Pass along our configuration to the child processes.
+	    # EXCEPT for the -outfile, because the parent process
+	    # needs to read and process output of children.
+	    set childargv [list]
+	    foreach opt [Configure] {
+		if {$opt eq "-outfile"} {continue}
+		set value [Configure $opt]
+		# Don't bother passing default configuration options
+		if {$value eq $DefaultValue($opt)} {
+			continue
+		}
+		lappend childargv $opt $value
+	    }
+	    set cmd [linsert $childargv 0 | $shell $file]
+	    if {[catch {
+		incr numTestFiles
+		set pipeFd [open $cmd "r"]
+		while {[gets $pipeFd line] >= 0} {
+		    if {[regexp [join {
+			    {^([^:]+):\t}
+			    {Total\t([0-9]+)\t}
+			    {Passed\t([0-9]+)\t}
+			    {Skipped\t([0-9]+)\t}
+			    {Failed\t([0-9]+)}
+			    } ""] $line null testFile \
+			    Total Passed Skipped Failed]} {
+			foreach index {Total Passed Skipped Failed} {
+			    incr numTests($index) [set $index]
+			}
+			if {$Failed > 0} {
+			    lappend failFiles $testFile
+			}
+		    } elseif {[regexp [join {
+			    {^Number of tests skipped }
+			    {for each constraint:}
+			    {|^\t(\d+)\t(.+)$}
+			    } ""] $line match skipped constraint]} {
+			if {[string match \t* $match]} {
+			    AddToSkippedBecause $constraint $skipped
+			}
+		    } else {
+			puts [outputChannel] $line
+		    }
+		}
+		close $pipeFd
+	    } msg]} {
+		puts [outputChannel] "Test file error: $msg"
+		# append the name of the test to a list to be reported
+		# later
+		lappend testFileFailures $file
+	    }
+	}
+    }
+
+    # cleanup
+    puts [outputChannel] "\nTests ended at [eval $timeCmd]"
+    cleanupTests 1
+    if {[info exists testFileFailures]} {
+	puts [outputChannel] "\nTest files exiting with errors:  \n"
+	foreach file $testFileFailures {
+	    puts [outputChannel] "  [file tail $file]\n"
+	}
+    }
+
+    # Checking for subdirectories in which to run tests
+    foreach directory [GetMatchingDirectories [testsDirectory]] {
+	set dir [file tail $directory]
+	puts [outputChannel] [string repeat ~ 44]
+	puts [outputChannel] "$dir test began at [eval $timeCmd]\n"
+
+	uplevel 1 [list ::source [file join $directory all.tcl]]
+
+	set endTime [eval $timeCmd]
+	puts [outputChannel] "\n$dir test ended at $endTime"
+	puts [outputChannel] ""
+	puts [outputChannel] [string repeat ~ 44]
+    }
+    return
+}
+
+#####################################################################
+
+# Test utility procs - not used in tcltest, but may be useful for
+# testing.
+
+# tcltest::loadTestedCommands --
+#
+#     Uses the specified script to load the commands to test. Allowed to
+#     be empty, as the tested commands could have been compiled into the
+#     interpreter.
+#
+# Arguments
+#     none
+#
+# Results
+#     none
+#
+# Side Effects:
+#     none.
+
+proc tcltest::loadTestedCommands {} {
+    return [uplevel 1 [loadScript]]
+}
+
+# tcltest::saveState --
+#
+#	Save information regarding what procs and variables exist.
+#
+# Arguments:
+#	none
+#
+# Results:
+#	Modifies the variable saveState
+#
+# Side effects:
+#	None.
+
+proc tcltest::saveState {} {
+    variable saveState
+    uplevel 1 [list ::set [namespace which -variable saveState]] \
+	    {[::list [::info procs] [::info vars]]}
+    DebugPuts  2 "[lindex [info level 0] 0]: $saveState"
+    return
+}
+
+# tcltest::restoreState --
+#
+#	Remove procs and variables that didn't exist before the call to
+#       [saveState].
+#
+# Arguments:
+#	none
+#
+# Results:
+#	Removes procs and variables from your environment if they don't
+#	exist in the saveState variable.
+#
+# Side effects:
+#	None.
+
+proc tcltest::restoreState {} {
+    variable saveState
+    foreach p [uplevel 1 {::info procs}] {
+	if {($p ni [lindex $saveState 0]) && ("[namespace current]::$p" ne
+		[uplevel 1 [list ::namespace origin $p]])} {
+
+	    DebugPuts 2 "[lindex [info level 0] 0]: Removing proc $p"
+	    uplevel 1 [list ::catch [list ::rename $p {}]]
+	}
+    }
+    foreach p [uplevel 1 {::info vars}] {
+	if {$p ni [lindex $saveState 1]} {
+	    DebugPuts 2 "[lindex [info level 0] 0]:\
+		    Removing variable $p"
+	    uplevel 1 [list ::catch [list ::unset $p]]
+	}
+    }
+    return
+}
+
+# tcltest::normalizeMsg --
+#
+#	Removes "extra" newlines from a string.
+#
+# Arguments:
+#	msg        String to be modified
+#
+# Results:
+#	string with extra newlines removed
+#
+# Side effects:
+#	None.
+
+proc tcltest::normalizeMsg {msg} {
+    regsub "\n$" [string tolower $msg] "" msg
+    set msg [string map [list "\n\n" "\n"] $msg]
+    return [string map [list "\n\}" "\}"] $msg]
+}
+
+# tcltest::makeFile --
+#
+# Create a new file with the name <name>, and write <contents> to it.
+#
+# If this file hasn't been created via makeFile since the last time
+# cleanupTests was called, add it to the $filesMade list, so it will be
+# removed by the next call to cleanupTests.
+#
+# Arguments:
+#	contents        content of the new file
+#       name            name of the new file
+#       directory       directory name for new file
+#
+# Results:
+#	absolute path to the file created
+#
+# Side effects:
+#	None.
+
+proc tcltest::makeFile {contents name {directory ""}} {
+    variable filesMade
+    FillFilesExisted
+
+    if {[llength [info level 0]] == 3} {
+	set directory [temporaryDirectory]
+    }
+
+    set fullName [file join $directory $name]
+
+    DebugPuts 3 "[lindex [info level 0] 0]:\
+	     putting ``$contents'' into $fullName"
+
+    set fd [open $fullName w]
+    chan configure $fd -translation lf
+    if {[string index $contents end] eq "\n"} {
+	puts -nonewline $fd $contents
+    } else {
+	puts $fd $contents
+    }
+    close $fd
+
+    if {$fullName ni $filesMade} {
+	lappend filesMade $fullName
+    }
+    return $fullName
+}
+
+# tcltest::removeFile --
+#
+#	Removes the named file from the filesystem
+#
+# Arguments:
+#	name          file to be removed
+#       directory     directory from which to remove file
+#
+# Results:
+#	return value from [file delete]
+#
+# Side effects:
+#	None.
+
+proc tcltest::removeFile {name {directory ""}} {
+    variable filesMade
+    FillFilesExisted
+    if {[llength [info level 0]] == 2} {
+	set directory [temporaryDirectory]
+    }
+    set fullName [file join $directory $name]
+    DebugPuts 3 "[lindex [info level 0] 0]: removing $fullName"
+    set idx [lsearch -exact $filesMade $fullName]
+    set filesMade [lreplace $filesMade $idx $idx]
+    if {$idx == -1} {
+	DebugDo 1 {
+	    Warn "removeFile removing \"$fullName\":\n  not created by makeFile"
+	}
+    }
+    if {![file isfile $fullName]} {
+	DebugDo 1 {
+	    Warn "removeFile removing \"$fullName\":\n  not a file"
+	}
+    }
+    return [file delete -- $fullName]
+}
+
+# tcltest::makeDirectory --
+#
+# Create a new dir with the name <name>.
+#
+# If this dir hasn't been created via makeDirectory since the last time
+# cleanupTests was called, add it to the $directoriesMade list, so it
+# will be removed by the next call to cleanupTests.
+#
+# Arguments:
+#       name            name of the new directory
+#       directory       directory in which to create new dir
+#
+# Results:
+#	absolute path to the directory created
+#
+# Side effects:
+#	None.
+
+proc tcltest::makeDirectory {name {directory ""}} {
+    variable filesMade
+    FillFilesExisted
+    if {[llength [info level 0]] == 2} {
+	set directory [temporaryDirectory]
+    }
+    set fullName [file join $directory $name]
+    DebugPuts 3 "[lindex [info level 0] 0]: creating $fullName"
+    file mkdir $fullName
+    if {$fullName ni $filesMade} {
+	lappend filesMade $fullName
+    }
+    return $fullName
+}
+
+# tcltest::removeDirectory --
+#
+#	Removes a named directory from the file system.
+#
+# Arguments:
+#	name          Name of the directory to remove
+#       directory     Directory from which to remove
+#
+# Results:
+#	return value from [file delete]
+#
+# Side effects:
+#	None
+
+proc tcltest::removeDirectory {name {directory ""}} {
+    variable filesMade
+    FillFilesExisted
+    if {[llength [info level 0]] == 2} {
+	set directory [temporaryDirectory]
+    }
+    set fullName [file join $directory $name]
+    DebugPuts 3 "[lindex [info level 0] 0]: deleting $fullName"
+    set idx [lsearch -exact $filesMade $fullName]
+    set filesMade [lreplace $filesMade $idx $idx]
+    if {$idx == -1} {
+	DebugDo 1 {
+	    Warn "removeDirectory removing \"$fullName\":\n  not created\
+		    by makeDirectory"
+	}
+    }
+    if {![file isdirectory $fullName]} {
+	DebugDo 1 {
+	    Warn "removeDirectory removing \"$fullName\":\n  not a directory"
+	}
+    }
+    return [file delete -force -- $fullName]
+}
+
+# tcltest::viewFile --
+#
+#	reads the content of a file and returns it
+#
+# Arguments:
+#	name of the file to read
+#       directory in which file is located
+#
+# Results:
+#	content of the named file
+#
+# Side effects:
+#	None.
+
+proc tcltest::viewFile {name {directory ""}} {
+    FillFilesExisted
+    if {[llength [info level 0]] == 2} {
+	set directory [temporaryDirectory]
+    }
+    set fullName [file join $directory $name]
+    set f [open $fullName]
+    set data [read -nonewline $f]
+    close $f
+    return $data
+}
+
+# tcltest::bytestring --
+#
+# Construct a string that consists of the requested sequence of bytes,
+# as opposed to a string of properly formed UTF-8 characters.
+# This allows the tester to
+# 1. Create denormalized or improperly formed strings to pass to C
+#    procedures that are supposed to accept strings with embedded NULL
+#    bytes.
+# 2. Confirm that a string result has a certain pattern of bytes, for
+#    instance to confirm that "\xe0\0" in a Tcl script is stored
+#    internally in UTF-8 as the sequence of bytes "\xc3\xa0\xc0\x80".
+#
+# Generally, it's a bad idea to examine the bytes in a Tcl string or to
+# construct improperly formed strings in this manner, because it involves
+# exposing that Tcl uses UTF-8 internally.
+#
+# Arguments:
+#	string being converted
+#
+# Results:
+#	result fom encoding
+#
+# Side effects:
+#	None
+
+proc tcltest::bytestring {string} {
+    return [encoding convertfrom identity $string]
+}
+
+# tcltest::OpenFiles --
+#
+#	used in io tests, uses testchannel
+#
+# Arguments:
+#	None.
+#
+# Results:
+#	???
+#
+# Side effects:
+#	None.
+
+proc tcltest::OpenFiles {} {
+    if {[catch {testchannel open} result]} {
+	return {}
+    }
+    return $result
+}
+
+# tcltest::LeakFiles --
+#
+#	used in io tests, uses testchannel
+#
+# Arguments:
+#	None.
+#
+# Results:
+#	???
+#
+# Side effects:
+#	None.
+
+proc tcltest::LeakFiles {old} {
+    if {[catch {testchannel open} new]} {
+	return {}
+    }
+    set leak {}
+    foreach p $new {
+	if {$p ni $old} {
+	    lappend leak $p
+	}
+    }
+    return $leak
+}
+
+#
+# Internationalization / ISO support procs     -- dl
+#
+
+# tcltest::SetIso8859_1_Locale --
+#
+#	used in cmdIL.test, uses testlocale
+#
+# Arguments:
+#	None.
+#
+# Results:
+#	None.
+#
+# Side effects:
+#	None.
+
+proc tcltest::SetIso8859_1_Locale {} {
+    variable previousLocale
+    variable isoLocale
+    if {[info commands testlocale] != ""} {
+	set previousLocale [testlocale ctype]
+	testlocale ctype $isoLocale
+    }
+    return
+}
+
+# tcltest::RestoreLocale --
+#
+#	used in cmdIL.test, uses testlocale
+#
+# Arguments:
+#	None.
+#
+# Results:
+#	None.
+#
+# Side effects:
+#	None.
+
+proc tcltest::RestoreLocale {} {
+    variable previousLocale
+    if {[info commands testlocale] != ""} {
+	testlocale ctype $previousLocale
+    }
+    return
+}
+
+# tcltest::threadReap --
+#
+#	Kill all threads except for the main thread.
+#	Do nothing if testthread is not defined.
+#
+# Arguments:
+#	none.
+#
+# Results:
+#	Returns the number of existing threads.
+#
+# Side Effects:
+#       none.
+#
+
+proc tcltest::threadReap {} {
+    if {[info commands testthread] ne {}} {
+
+	# testthread built into tcltest
+
+	testthread errorproc ThreadNullError
+	while {[llength [testthread names]] > 1} {
+	    foreach tid [testthread names] {
+		if {$tid != [mainThread]} {
+		    catch {
+			testthread send -async $tid {testthread exit}
+		    }
+		}
+	    }
+	    ## Enter a bit a sleep to give the threads enough breathing
+	    ## room to kill themselves off, otherwise the end up with a
+	    ## massive queue of repeated events
+	    after 1
+	}
+	testthread errorproc ThreadError
+	return [llength [testthread names]]
+    } elseif {[info commands thread::id] ne {}} {
+
+	# Thread extension
+
+	thread::errorproc ThreadNullError
+	while {[llength [thread::names]] > 1} {
+	    foreach tid [thread::names] {
+		if {$tid != [mainThread]} {
+		    catch {thread::send -async $tid {thread::exit}}
+		}
+	    }
+	    ## Enter a bit a sleep to give the threads enough breathing
+	    ## room to kill themselves off, otherwise the end up with a
+	    ## massive queue of repeated events
+	    after 1
+	}
+	thread::errorproc ThreadError
+	return [llength [thread::names]]
+    } else {
+	return 1
+    }
+    return 0
+}
+
+# Initialize the constraints and set up command line arguments
+namespace eval tcltest {
+    # Define initializers for all the built-in contraint definitions
+    DefineConstraintInitializers
+
+    # Set up the constraints in the testConstraints array to be lazily
+    # initialized by a registered initializer, or by "false" if no
+    # initializer is registered.
+    trace add variable testConstraints read [namespace code SafeFetch]
+
+    # Only initialize constraints at package load time if an
+    # [initConstraintsHook] has been pre-defined.  This is only
+    # for compatibility support.  The modern way to add a custom
+    # test constraint is to just call the [testConstraint] command
+    # straight away, without all this "hook" nonsense.
+    if {[namespace current] eq
+	    [namespace qualifiers [namespace which initConstraintsHook]]} {
+	InitConstraints
+    } else {
+	proc initConstraintsHook {} {}
+    }
+
+    # Define the standard match commands
+    customMatch exact	[list string equal]
+    customMatch glob	[list string match]
+    customMatch regexp	[list regexp --]
+
+    # If the TCLTEST_OPTIONS environment variable exists, configure
+    # tcltest according to the option values it specifies.  This has
+    # the effect of resetting tcltest's default configuration.
+    proc ConfigureFromEnvironment {} {
+	upvar #0 env(TCLTEST_OPTIONS) options
+	if {[catch {llength $options} msg]} {
+	    Warn "invalid TCLTEST_OPTIONS \"$options\":\n  invalid\
+		    Tcl list: $msg"
+	    return
+	}
+	if {[llength $options] % 2} {
+	    Warn "invalid TCLTEST_OPTIONS: \"$options\":\n  should be\
+		    -option value ?-option value ...?"
+	    return
+	}
+	if {[catch {Configure {*}$options} msg]} {
+	    Warn "invalid TCLTEST_OPTIONS: \"$options\":\n  $msg"
+	    return
+	}
+    }
+    if {[info exists ::env(TCLTEST_OPTIONS)]} {
+	ConfigureFromEnvironment
+    }
+
+    proc LoadTimeCmdLineArgParsingRequired {} {
+	set required false
+	if {[info exists ::argv] && ("-help" in $::argv)} {
+	    # The command line asks for -help, so give it (and exit)
+	    # right now.  ([configure] does not process -help)
+	    set required true
+	}
+	foreach hook { PrintUsageInfoHook processCmdLineArgsHook
+			processCmdLineArgsAddFlagsHook } {
+	    if {[namespace current] eq
+		    [namespace qualifiers [namespace which $hook]]} {
+		set required true
+	    } else {
+		proc $hook args {}
+	    }
+	}
+	return $required
+    }
+
+    # Only initialize configurable options from the command line arguments
+    # at package load time if necessary for backward compatibility.  This
+    # lets the tcltest user call [configure] for themselves if they wish.
+    # Traces are established for auto-configuration from the command line
+    # if any configurable options are accessed before the user calls
+    # [configure].
+    if {[LoadTimeCmdLineArgParsingRequired]} {
+	ProcessCmdLineArgs
+    } else {
+	EstablishAutoConfigureTraces
+    }
+
+    package provide [namespace tail [namespace current]] $Version
+}