path: root/tkimg/tests/defs

# This file contains support code for the Tcl test suite.  It is
# normally sourced by the individual files in the test suite before
# they run their tests.  This improved approach to testing was designed
# and initially implemented by Mary Ann May-Pumphrey of Sun Microsystems.
#
# Copyright (c) 1994-1996 Sun Microsystems, Inc.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# SCCS: @(#) defs 1.29 96/12/08 18:33:59

if ![info exists VERBOSE] {
    set VERBOSE 0
}
if ![info exists TESTS] {
    set TESTS {}
}

# Check configuration information that will determine which tests
# to run.  To do this, create an array testConfig.  Each element
# has a 0 or 1 value, and the following elements are defined:
#	unixOnly -	1 means this is a UNIX platform, so it's OK
#			to run tests that only work under UNIX.
#	macOnly -	1 means this is a Mac platform, so it's OK
#			to run tests that only work on Macs.
#	pcOnly -	1 means this is a PC platform, so it's OK to
#			run tests that only work on PCs.
#	nonPortable -	1 means this the tests are being running in
#			the master Tcl/Tk development environment;
#			Some tests are inherently non-portable because
#			they depend on things like word length, file system
#			configuration, window manager, etc.  These tests
#			are only run in the main Tcl development directory
#			where the configuration is well known.  The presence
#			of the file "doAllTests" in this directory indicates
#			that it is safe to run non-portable tests.
#	fonts -		1 means that this platform uses fonts with
#			well-know geometries, so it is safe to run
#			tests that depend on particular font sizes.

catch {unset testConfig}
if {$tcl_platform(platform) == "unix"} {
    set testConfig(unixOnly) 1
} else {
    set testConfig(unixOnly) 0
} 
if {$tcl_platform(platform) == "macintosh"} {
    set testConfig(macOnly) 1
} else {
    set testConfig(macOnly) 0
} 
if {$tcl_platform(platform) == "windows"} {
    set testConfig(pcOnly) 1
} else {
    set testConfig(pcOnly) 0
}
set testConfig(nonPortable) [file exists doAllTests]

# If there is no "memory" command (because memory debugging isn't
# enabled), generate a dummy command that does nothing.

if {[info commands memory] == ""} {
    proc memory args {}
}

proc print_verbose {name description script code answer} {
    puts stdout "\n"
    puts stdout "==== $name $description"
    puts stdout "==== Contents of test case:"
    puts stdout "$script"
    if {$code != 0} {
	if {$code == 1} {
	    puts stdout "==== Test generated error:"
	    puts stdout $answer
	} elseif {$code == 2} {
	    puts stdout "==== Test generated return exception;  result was:"
	    puts stdout $answer
	} elseif {$code == 3} {
	    puts stdout "==== Test generated break exception"
	} elseif {$code == 4} {
	    puts stdout "==== Test generated continue exception"
	} else {
	    puts stdout "==== Test generated exception $code;  message was:"
	    puts stdout $answer
	}
    } else {
	puts stdout "==== Result was:"
	puts stdout "$answer"
    }
}

# 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 TESTS variable, or if one of the elements
# of "constraints" turns out not to be true.
#
# 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.
# constraints -		A list of one or more keywords, each of
#			which must be the name of an element in
#			the array "testConfig".  If any of these
#			elements is zero, the test is skipped.
#			This argument may be omitted.
# script -		Script to run to carry out the test.  It must
#			return a result that can be checked for
#			correctness.
# answer -		Expected result from script.

proc test {name description script answer args} {
    global VERBOSE TESTS testConfig
    if {[string compare $TESTS ""] != 0} then {
	set ok 0
	foreach test $TESTS {
	    if [string match $test $name] then {
		set ok 1
		break
	    }
        }
	if !$ok then return
    }
    set i [llength $args]
    if {$i == 0} {
	# Empty body
    } elseif {$i == 1} {
	# "constraints" argument exists;  shuffle arguments down, then
	# make sure that the constraints are satisfied.

	set constraints $script
	set script $answer
	set answer [lindex $args 0]
	foreach constraint $constraints {
	    if {![info exists testConfig($constraint)]
		    || !$testConfig($constraint)} {
		if $VERBOSE then {
		    puts stdout "++++ $name SKIPPED"
		}
		return
	    }
	}
    } else {
	error "wrong # args: must be \"test name description ?constraints? script answer\""
    }
    memory tag $name
    set code [catch {uplevel $script} result]
    if {$code != 0} {
	print_verbose $name $description $script \
		$code $result
    } elseif {[string compare $result $answer] == 0} then { 
	if $VERBOSE then {
	    print_verbose $name $description $script \
		    $code $result
	    puts stdout "++++ $name PASSED"
	}
    } else { 
	print_verbose $name $description $script \
		$code $result 
	puts stdout "---- Result should have been:"
	puts stdout "$answer"
	puts stdout "---- $name FAILED" 
    }
}

proc dotests {file args} {
    global TESTS
    set savedTests $TESTS
    set TESTS $args
    source $file
    set TESTS $savedTests
}

# If the main window isn't already mapped (e.g. because the tests are
# being run automatically) , specify a precise size for it so that the
# user won't have to position it manually.

if {![winfo ismapped .]} {
    wm geometry . +0+0
    update
}

# The following code can be used to perform tests involving a second
# process running in the background.

# Locate wish executable

lappend auto_path [file dirname [pwd]]

package require Img

set wish [list [info nameofexecutable]]
if {$wish == "{}"} {
    set wish {}
    puts "Unable to find wish executable, skipping multiple process tests."
}

# Create background process

proc setupbg {{args ""}} {
    global wish fd bgData
    if {$wish == ""} {
        error "you're not running wish so setupbg should not have been called"
    }
    if {[info exists fd] && ($fd != "")} {
	cleanupbg
    }
    set fd [open "|$wish -geometry +0+0 -name wish $args" r+]
    puts $fd "puts foo; flush stdout"
    flush $fd
    if {[gets $fd data] < 0} {
        error "unexpected EOF from \"$wish\""
    }
    if [string compare $data foo] {
        error "unexpected output from background process \"$data\""
    }
    fileevent $fd readable bgReady
}

# Send a command to the background process, catching errors and
# flushing I/O channels
proc dobg {command} {
    global fd bgData bgDone
    puts $fd "catch [list $command] msg; update; puts \$msg; puts **DONE**; flush stdout"
    flush $fd
    set bgDone 0
    set bgData {}
    tkwait variable bgDone
    set bgData
}

# Data arrived from background process.  Check for special marker
# indicating end of data for this command, and make data available
# to dobg procedure.
proc bgReady {} {
    global fd bgData bgDone
    set x [gets $fd]
    if [eof $fd] {
	fileevent $fd readable {}
	set bgDone 1
    } elseif {$x == "**DONE**"} {
	set bgDone 1
    } else {
	append bgData $x
    }
}

# Exit the background process, and close the pipes
proc cleanupbg {} {
    global fd
    catch {
	puts $fd "exit"
	close $fd
    }
    set fd ""
}

proc makeFile {contents name} {
    set fd [open $name w]
    fconfigure $fd -translation lf
    if {[string index $contents [expr [string length $contents] - 1]] == "\n"} {
	puts -nonewline $fd $contents
    } else {
	puts $fd $contents
    }
    close $fd
}

proc removeFile {name} {
    global tcl_platform
    if {$tcl_platform(platform) == "macintosh"} {
	catch {rm $name}
    } else {
	catch {exec rm -f $name}
    }
}