path: root/tests/stringComp.test

# Commands covered:  string
#
# This file contains a collection of tests for one or more of the Tcl
# built-in commands.  Sourcing this file into Tcl runs the tests and
# generates output for errors.  No output means no errors were found.
#
# This differs from the original string tests in that the tests call
# things in procs, which uses the compiled string code instead of
# the runtime parse string code.  The tests of import should match
# their equivalent number in string.test.
#
# Copyright (c) 2001 by ActiveState Corporation.
# Copyright (c) 2001 by Kevin B. Kenny.  All rights reserved.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.

if {"::tcltest" ni [namespace children]} {
    package require tcltest 2.5
    namespace import -force ::tcltest::*
}

::tcltest::loadTestedCommands
catch [list package require -exact Tcltest [info patchlevel]]

# Some tests require the testobj command

testConstraint testobj [expr {[info commands testobj] != {}}]
testConstraint memory [llength [info commands memory]]
if {[testConstraint memory]} {
    proc getbytes {} {
	set lines [split [memory info] \n]
	return [lindex $lines 3 3]
    }
    proc leaktest {script {iterations 3}} {
	set end [getbytes]
	for {set i 0} {$i < $iterations} {incr i} {
	    uplevel 1 $script
	    set tmp $end
	    set end [getbytes]
	}
	return [expr {$end - $tmp}]
    }
}

test stringComp-1.1 {error conditions} {
    proc foo {} {string gorp a b}
    list [catch {foo} msg] $msg
} {1 {unknown or ambiguous subcommand "gorp": must be bytelength, cat, compare, equal, first, index, is, last, length, map, match, range, repeat, replace, reverse, tolower, totitle, toupper, trim, trimleft, trimright, wordend, or wordstart}}
test stringComp-1.2 {error conditions} {
    proc foo {} {string}
    list [catch {foo} msg] $msg
} {1 {wrong # args: should be "string subcommand ?arg ...?"}}
test stringComp-1.3 {error condition - undefined method during compile} {
    # We don't want this to complain about 'never' because it may never
    # be called, or string may get redefined.  This must compile OK.
    proc foo {str i} {
        if {"yes" == "no"} { string never called but complains here }
        string index $str $i
    }
    foo abc 0
} a

## Test string compare|equal over equal constraints
## Use result for string compare, and negate it for string equal
## The body will be tested both in and outside a proc
set i 0
foreach {tname tbody tresult tcode} {
    {too few args} {
	string compare a
    } {wrong # args: should be "string compare ?-nocase? ?-length int? string1 string2"} {error}
    {bad args} {
	string compare a b c
    } {bad option "a": must be -nocase or -length} {error}
    {bad args} {
	string compare -length -nocase str1 str2
    } {expected integer but got "-nocase"} {error}
    {too many args} {
	string compare -length 10 -nocase str1 str2 str3
    } {wrong # args: should be "string compare ?-nocase? ?-length int? string1 string2"} {error}
    {compare with length unspecified} {
	string compare -length 10 10
    } {wrong # args: should be "string compare ?-nocase? ?-length int? string1 string2"} {error}
    {basic operation fail} {
	string compare abcde abdef
    } {-1} {}
    {basic operation success} {
	string compare abcde abcde
    } {0} {}
    {with length} {
	string compare -length 2 abcde abxyz
    } {0} {}
    {with special index} {
	string compare -length end-3 abcde abxyz
    } {expected integer but got "end-3"} {error}
    {unicode} {
	string compare ab\u7266 ab\u7267
    } {-1} {}
    {unicode} {string compare \334 \u00dc} 0 {}
    {unicode} {string compare \334 \u00fc} -1 {}
    {unicode} {string compare \334\334\334\374\374 \334\334\334\334\334} 1 {}
    {high bit} {
	# This test will fail if the underlying comparison
	# is using signed chars instead of unsigned chars.
	# (like SunOS's default memcmp thus the compat/memcmp.c)
	string compare "\x80" "@"
	# Nb this tests works also in utf-8 space because \x80 is
	# translated into a 2 or more bytelength but whose first byte has
	# the high bit set.
    } {1} {}
    {-nocase 1} {string compare -nocase abcde abdef} {-1} {}
    {-nocase 2} {string compare -nocase abcde Abdef} {-1} {}
    {-nocase 3} {string compare -nocase abcde ABCDE} {0} {}
    {-nocase 4} {string compare -nocase abcde abcde} {0} {}
    {-nocase unicode} {
	string compare -nocase \334 \u00dc
    } 0 {}
    {-nocase unicode} {
	string compare -nocase \334\334\334\374\u00fc \334\334\334\334\334
    } 0 {}
    {-nocase with length} {
	string compare -length 2 -nocase abcde Abxyz
    } {0} {}
    {-nocase with length} {
	string compare -nocase -length 3 abcde Abxyz
    } {-1} {}
    {-nocase with length <= 0} {
	string compare -nocase -length -1 abcde AbCdEf
    } {-1} {}
    {-nocase with excessive length} {
	string compare -nocase -length 50 AbCdEf abcde
    } {1} {}
    {-len unicode} {
	# These are strings that are 6 BYTELENGTH long, but the length
	# shouldn't make a different because there are actually 3 CHARS long
	string compare -len 5 \334\334\334 \334\334\374
    } -1 {}
    {-nocase with special index} {
	string compare -nocase -length end-3 Abcde abxyz
    } {expected integer but got "end-3"} error
    {null strings} {
	string compare "" ""
    } 0 {}
    {null strings} {
	string compare "" foo
    } -1 {}
    {null strings} {
	string compare foo ""
    } 1 {}
    {-nocase null strings} {
	string compare -nocase "" ""
    } 0 {}
    {-nocase null strings} {
	string compare -nocase "" foo
    } -1 {}
    {-nocase null strings} {
	string compare -nocase foo ""
    } 1 {}
    {with length, unequal strings} {
	string compare -length 2 abc abde
    } 0 {}
    {with length, unequal strings} {
	string compare -length 2 ab abde
    } 0 {}
    {with NUL character vs. other ASCII} {
	# Be careful here, since UTF-8 rep comparison with memcmp() of
	# these puts chars in the wrong order
	string compare \x00 \x01
    } -1 {}
    {high bit} {
	string compare "a\x80" "a@"
    } 1 {}
    {high bit} {
	string compare "a\x00" "a\x01"
    } -1 {}
    {high bit} {
	string compare "\x00\x00" "\x00\x01"
    } -1 {}
    {binary equal} {
	string compare [binary format a100 0] [binary format a100 0]
    } 0 {}
    {binary neq} {
	string compare [binary format a100a 0 1] [binary format a100a 0 0]
    } 1 {}
    {binary neq inequal length} {
	string compare [binary format a20a 0 1] [binary format a100a 0 0]
    } 1 {}
} {
    if {$tname eq ""} { continue }
    if {$tcode eq ""} { set tcode ok }
    test stringComp-2.[incr i] "string compare, $tname" \
	-body [list eval $tbody] \
	-returnCodes $tcode -result $tresult
    test stringComp-2.[incr i] "string compare bc, $tname" \
	-body "[list proc foo {} $tbody];foo" \
	-returnCodes $tcode -result $tresult
    if {"error" ni $tcode} {
	set tresult [expr {!$tresult}]
    } else {
	set tresult [string map {compare equal} $tresult]
    }
    set tbody [string map {compare equal} $tbody]
    test stringComp-2.[incr i] "string equal, $tname" \
	-body [list eval $tbody] \
	-returnCodes $tcode -result $tresult
    test stringComp-2.[incr i] "string equal bc, $tname" \
	-body "[list proc foo {} $tbody];foo" \
	-returnCodes $tcode -result $tresult
}

# need a few extra tests short abbr cmd
test stringComp-3.1 {string compare, shortest method name} {
    proc foo {} {string co abcde ABCDE}
    foo
} 1
test stringComp-3.2 {string equal, shortest method name} {
    proc foo {} {string e abcde ABCDE}
    foo
} 0
test stringComp-3.3 {string equal -nocase} {
    proc foo {} {string eq -nocase abcde ABCDE}
    foo
} 1

test stringComp-4.1 {string first, too few args} {
    proc foo {} {string first a}
    list [catch {foo} msg] $msg
} {1 {wrong # args: should be "string first needleString haystackString ?startIndex?"}}
test stringComp-4.2 {string first, bad args} {
    proc foo {} {string first a b c}
    list [catch {foo} msg] $msg
} {1 {bad index "c": must be integer?[+-]integer? or end?[+-]integer?}}
test stringComp-4.3 {string first, too many args} {
    proc foo {} {string first a b 5 d}
    list [catch {foo} msg] $msg
} {1 {wrong # args: should be "string first needleString haystackString ?startIndex?"}}
test stringComp-4.4 {string first} {
    proc foo {} {string first bq abcdefgbcefgbqrs}
    foo
} 12
test stringComp-4.5 {string first} {
    proc foo {} {string fir bcd abcdefgbcefgbqrs}
    foo
} 1
test stringComp-4.6 {string first} {
    proc foo {} {string f b abcdefgbcefgbqrs}
    foo
} 1
test stringComp-4.7 {string first} {
    proc foo {} {string first xxx x123xx345xxx789xxx012}
    foo
} 9
test stringComp-4.8 {string first} {
    proc foo {} {string first "" x123xx345xxx789xxx012}
    foo
} -1
test stringComp-4.9 {string first, unicode} {
    proc foo {} {string first x abc\u7266x}
    foo
} 4
test stringComp-4.10 {string first, unicode} {
    proc foo {} {string first \u7266 abc\u7266x}
    foo
} 3
test stringComp-4.11 {string first, start index} {
    proc foo {} {string first \u7266 abc\u7266x 3}
    foo
} 3
test stringComp-4.12 {string first, start index} {
    proc foo {} {string first \u7266 abc\u7266x 4}
    foo
} -1
test stringComp-4.13 {string first, start index} {
    proc foo {} {string first \u7266 abc\u7266x end-2}
    foo
} 3
test stringComp-4.14 {string first, negative start index} {
    proc foo {} {string first b abc -1}
    foo
} 1

test stringComp-5.1 {string index} {
    proc foo {} {string index}
    list [catch {foo} msg] $msg
} {1 {wrong # args: should be "string index string charIndex"}}
test stringComp-5.2 {string index} {
    proc foo {} {string index a b c}
    list [catch {foo} msg] $msg
} {1 {wrong # args: should be "string index string charIndex"}}
test stringComp-5.3 {string index} {
    proc foo {} {string index abcde 0}
    foo
} a
test stringComp-5.4 {string index} {
    proc foo {} {string in abcde 4}
    foo
} e
test stringComp-5.5 {string index} {
    proc foo {} {string index abcde 5}
    foo
} {}
test stringComp-5.6 {string index} {
    proc foo {} {string index abcde -10}
    list [catch {foo} msg] $msg
} {0 {}}
test stringComp-5.7 {string index} {
    proc foo {} {string index a xyz}
    list [catch {foo} msg] $msg
} {1 {bad index "xyz": must be integer?[+-]integer? or end?[+-]integer?}}
test stringComp-5.8 {string index} {
    proc foo {} {string index abc end}
    foo
} c
test stringComp-5.9 {string index} {
    proc foo {} {string index abc end-1}
    foo
} b
test stringComp-5.10 {string index, unicode} {
    proc foo {} {string index abc\u7266d 4}
    foo
} d
test stringComp-5.11 {string index, unicode} {
    proc foo {} {string index abc\u7266d 3}
    foo
} \u7266
test stringComp-5.12 {string index, unicode over char length, under byte length} {
    proc foo {} {string index \334\374\334\374 6}
    foo
} {}
test stringComp-5.13 {string index, bytearray object} {
    proc foo {} {string index [binary format a5 fuz] 0}
    foo
} f
test stringComp-5.14 {string index, bytearray object} {
    proc foo {} {string index [binary format I* {0x50515253 0x52}] 3}
    foo
} S
test stringComp-5.15 {string index, bytearray object} {
    proc foo {} {
	set b [binary format I* {0x50515253 0x52}]
	set i1 [string index $b end-6]
	set i2 [string index $b 1]
	string compare $i1 $i2
    }
    foo
} 0
test stringComp-5.16 {string index, bytearray object with string obj shimmering} {
    proc foo {} {
	set str "0123456789\x00 abcdedfghi"
	binary scan $str H* dump
	string compare [string index $str 10] \x00
    }
    foo
} 0
test stringComp-5.17 {string index, bad integer} -body {
    proc foo {} {string index "abc" 0o8}
    list [catch {foo} msg] $msg
} -match glob -result {1 {*invalid octal number*}}
test stringComp-5.18 {string index, bad integer} -body {
    proc foo {} {string index "abc" end-0o0289}
    list [catch {foo} msg] $msg
} -match glob -result {1 {*invalid octal number*}}
test stringComp-5.19 {string index, bytearray object out of bounds} {
    proc foo {} {string index [binary format I* {0x50515253 0x52}] -1}
    foo
} {}
test stringComp-5.20 {string index, bytearray object out of bounds} {
    proc foo {} {string index [binary format I* {0x50515253 0x52}] 20}
    foo
} {}


proc largest_int {} {
    # This will give us what the largest valid int on this machine is,
    # so we can test for overflow properly below on >32 bit systems
    set int 1
    set exp 7; # assume we get at least 8 bits
    while {$int > 0} { set int [expr {1 << [incr exp]}] }
    return [expr {$int-1}]
}

## string is
## not yet bc

catch {rename largest_int {}}

## string last
## not yet bc

## string length
## not yet bc
test stringComp-8.1 {string bytelength} {
    proc foo {} {string bytelength}
    list [catch {foo} msg] $msg
} {1 {wrong # args: should be "string bytelength string"}}
test stringComp-8.2 {string bytelength} {
    proc foo {} {string bytelength a b}
    list [catch {foo} msg] $msg
} {1 {wrong # args: should be "string bytelength string"}}
test stringComp-8.3 {string bytelength} {
    proc foo {} {string bytelength "\u00c7"}
    foo
} 2
test stringComp-8.4 {string bytelength} {
    proc foo {} {string b ""}
    foo
} 0

## string length
##
test stringComp-9.1 {string length} {
    proc foo {} {string length}
    list [catch {foo} msg] $msg
} {1 {wrong # args: should be "string length string"}}
test stringComp-9.2 {string length} {
    proc foo {} {string length a b}
    list [catch {foo} msg] $msg
} {1 {wrong # args: should be "string length string"}}
test stringComp-9.3 {string length} {
    proc foo {} {string length "a little string"}
    foo
} 15
test stringComp-9.4 {string length} {
    proc foo {} {string le ""}
    foo
} 0
test stringComp-9.5 {string length, unicode} {
    proc foo {} {string le "abcd\u7266"}
    foo
} 5
test stringComp-9.6 {string length, bytearray object} {
    proc foo {} {string length [binary format a5 foo]}
    foo
} 5
test stringComp-9.7 {string length, bytearray object} {
    proc foo {} {string length [binary format I* {0x50515253 0x52}]}
    foo
} 8

## string map
## not yet bc

## string match
##
test stringComp-11.1 {string match, too few args} {
    proc foo {} {string match a}
    list [catch {foo} msg] $msg
} {1 {wrong # args: should be "string match ?-nocase? pattern string"}}
test stringComp-11.2 {string match, too many args} {
    proc foo {} {string match a b c d}
    list [catch {foo} msg] $msg
} {1 {wrong # args: should be "string match ?-nocase? pattern string"}}
test stringComp-11.3 {string match} {
    proc foo {} {string match abc abc}
    foo
} 1
test stringComp-11.4 {string match} {
    proc foo {} {string mat abc abd}
    foo
} 0
test stringComp-11.5 {string match} {
    proc foo {} {string match ab*c abc}
    foo
} 1
test stringComp-11.6 {string match} {
    proc foo {} {string match ab**c abc}
    foo
} 1
test stringComp-11.7 {string match} {
    proc foo {} {string match ab* abcdef}
    foo
} 1
test stringComp-11.8 {string match} {
    proc foo {} {string match *c abc}
    foo
} 1
test stringComp-11.9 {string match} {
    proc foo {} {string match *3*6*9 0123456789}
    foo
} 1
test stringComp-11.10 {string match} {
    proc foo {} {string match *3*6*9 01234567890}
    foo
} 0
test stringComp-11.11 {string match} {
    proc foo {} {string match a?c abc}
    foo
} 1
test stringComp-11.12 {string match} {
    proc foo {} {string match a??c abc}
    foo
} 0
test stringComp-11.13 {string match} {
    proc foo {} {string match ?1??4???8? 0123456789}
    foo
} 1
test stringComp-11.14 {string match} {
    proc foo {} {string match {[abc]bc} abc}
    foo
} 1
test stringComp-11.15 {string match} {
    proc foo {} {string match {a[abc]c} abc}
    foo
} 1
test stringComp-11.16 {string match} {
    proc foo {} {string match {a[xyz]c} abc}
    foo
} 0
test stringComp-11.17 {string match} {
    proc foo {} {string match {12[2-7]45} 12345}
    foo
} 1
test stringComp-11.18 {string match} {
    proc foo {} {string match {12[ab2-4cd]45} 12345}
    foo
} 1
test stringComp-11.19 {string match} {
    proc foo {} {string match {12[ab2-4cd]45} 12b45}
    foo
} 1
test stringComp-11.20 {string match} {
    proc foo {} {string match {12[ab2-4cd]45} 12d45}
    foo
} 1
test stringComp-11.21 {string match} {
    proc foo {} {string match {12[ab2-4cd]45} 12145}
    foo
} 0
test stringComp-11.22 {string match} {
    proc foo {} {string match {12[ab2-4cd]45} 12545}
    foo
} 0
test stringComp-11.23 {string match} {
    proc foo {} {string match {a\*b} a*b}
    foo
} 1
test stringComp-11.24 {string match} {
    proc foo {} {string match {a\*b} ab}
    foo
} 0
test stringComp-11.25 {string match} {
    proc foo {} {string match {a\*\?\[\]\\\x} "a*?\[\]\\x"}
    foo
} 1
test stringComp-11.26 {string match} {
    proc foo {} {string match ** ""}
    foo
} 1
test stringComp-11.27 {string match} {
    proc foo {} {string match *. ""}
    foo
} 0
test stringComp-11.28 {string match} {
    proc foo {} {string match "" ""}
    foo
} 1
test stringComp-11.29 {string match} {
    proc foo {} {string match \[a a}
    foo
} 1
test stringComp-11.30 {string match, bad args} {
    proc foo {} {string match - b c}
    list [catch {foo} msg] $msg
} {1 {bad option "-": must be -nocase}}
test stringComp-11.31 {string match case} {
    proc foo {} {string match a A}
    foo
} 0
test stringComp-11.32 {string match nocase} {
    proc foo {} {string match -n a A}
    foo
} 1
test stringComp-11.33 {string match nocase} {
    proc foo {} {string match -nocase a\334 A\374}
    foo
} 1
test stringComp-11.34 {string match nocase} {
    proc foo {} {string match -nocase a*f ABCDEf}
    foo
} 1
test stringComp-11.35 {string match case, false hope} {
    # This is true because '_' lies between the A-Z and a-z ranges
    proc foo {} {string match {[A-z]} _}
    foo
} 1
test stringComp-11.36 {string match nocase range} {
    # This is false because although '_' lies between the A-Z and a-z ranges,
    # we lower case the end points before checking the ranges.
    proc foo {} {string match -nocase {[A-z]} _}
    foo
} 0
test stringComp-11.37 {string match nocase} {
    proc foo {} {string match -nocase {[A-fh-Z]} g}
    foo
} 0
test stringComp-11.38 {string match case, reverse range} {
    proc foo {} {string match {[A-fh-Z]} g}
    foo
} 1
test stringComp-11.39 {string match, *\ case} {
    proc foo {} {string match {*\abc} abc}
    foo
} 1
test stringComp-11.40 {string match, *special case} {
    proc foo {} {string match {*[ab]} abc}
    foo
} 0
test stringComp-11.41 {string match, *special case} {
    proc foo {} {string match {*[ab]*} abc}
    foo
} 1
test stringComp-11.42 {string match, *special case} {
    proc foo {} {string match "*\\" "\\"}
    foo
} 0
test stringComp-11.43 {string match, *special case} {
    proc foo {} {string match "*\\\\" "\\"}
    foo
} 1
test stringComp-11.44 {string match, *special case} {
    proc foo {} {string match "*???" "12345"}
    foo
} 1
test stringComp-11.45 {string match, *special case} {
    proc foo {} {string match "*???" "12"}
    foo
} 0
test stringComp-11.46 {string match, *special case} {
    proc foo {} {string match "*\\*" "abc*"}
    foo
} 1
test stringComp-11.47 {string match, *special case} {
    proc foo {} {string match "*\\*" "*"}
    foo
} 1
test stringComp-11.48 {string match, *special case} {
    proc foo {} {string match "*\\*" "*abc"}
    foo
} 0
test stringComp-11.49 {string match, *special case} {
    proc foo {} {string match "?\\*" "a*"}
    foo
} 1
test stringComp-11.50 {string match, *special case} {
    proc foo {} {string match "\\" "\\"}
    foo
} 0
test stringComp-11.51 {string match; *, -nocase and UTF-8} {
    proc foo {} {string match -nocase [binary format I 717316707] \
	    [binary format I 2028036707]}
    foo
} 1
test stringComp-11.52 {string match, null char in string} {
    proc foo {} {
	set ptn "*abc*"
	foreach elem [list "\u0000@abc" "@abc" "\u0000@abc\u0000" "blahabcblah"] {
	    lappend out [string match $ptn $elem]
	}
	set out
    }
    foo
} {1 1 1 1}
test stringComp-11.53 {string match, null char in pattern} {
    proc foo {} {
	set out ""
	foreach {ptn elem} [list \
		"*\u0000abc\u0000"  "\u0000abc\u0000" \
		"*\u0000abc\u0000"  "\u0000abc\u0000ef" \
		"*\u0000abc\u0000*" "\u0000abc\u0000ef" \
		"*\u0000abc\u0000"  "@\u0000abc\u0000ef" \
		"*\u0000abc\u0000*"  "@\u0000abc\u0000ef" \
		] {
	    lappend out [string match $ptn $elem]
	}
	set out
    }
    foo
} {1 0 1 0 1}
test stringComp-11.54 {string match, failure} {
    proc foo {} {
	set longString ""
	for {set i 0} {$i < 10} {incr i} {
	    append longString "abcdefghijklmnopqrstuvwxy\u0000z01234567890123"
	}
	list [string match *cba* $longString] \
		[string match *a*l*\u0000* $longString] \
		[string match *a*l*\u0000*123 $longString] \
		[string match *a*l*\u0000*123* $longString] \
		[string match *a*l*\u0000*cba* $longString] \
		[string match *===* $longString]
    }
    foo
} {0 1 1 1 0 0}

## string range
test stringComp-12.1 {Bug 3588366: end-offsets before start} {
    apply {s {
	string range $s 0 end-5
    }} 12345
} {}

## string repeat
## not yet bc

## string replace
test stringComp-14.1 {Bug 82e7f67325} {
    apply {x {
	set a [join $x {}]
	lappend b [string length [string replace ___! 0 2 $a]]
	lappend b [string length [string replace ___! 0 2 $a[unset a]]]
    }} {a b}
} {3 3}
test stringComp-14.2 {Bug 82e7f67325} memory {
    # As in stringComp-14.1, but make sure we don't retain too many refs
    leaktest {
	apply {x {
	    set a [join $x {}]
	    lappend b [string length [string replace ___! 0 2 $a]]
	    lappend b [string length [string replace ___! 0 2 $a[unset a]]]
	}} {a b}
    }
} {0}
test stringComp-14.3 {Bug 0dca3bfa8f} {
    apply {arg {
	set argCopy $arg
	set arg [string replace $arg 1 2 aa]
	# Crashes in comparison before fix
	expr {$arg ne $argCopy}
    }} abcde
} 1
test stringComp-14.4 {Bug 1af8de570511} {
    apply {{x y} {
	# Generate an unshared string value
	set val ""
	for { set i 0 } { $i < $x } { incr i } {
	    set val [format "0%s" $val]
	}
	string replace $val[unset val] 1 1 $y
    }} 4 x
} 0x00
test stringComp-14.5 {} {
    string length [string replace [string repeat a\u00fe 2] 3 end {}]
} 3

## string tolower
## not yet bc

## string toupper
## not yet bc

## string totitle
## not yet bc

## string trim*
## not yet bc

## string word*
## not yet bc

## string cat
test stringComp-29.1 {string cat, no arg} {
    proc foo {} {string cat}
    foo
} ""
test stringComp-29.2 {string cat, single arg} {
    proc foo {} {
	set x FOO
	string compare $x [string cat $x]
    }
    foo
} 0
test stringComp-29.3 {string cat, two args} {
    proc foo {} {
	set x FOO
	string compare $x$x [string cat $x $x]
    }
    foo
} 0
test stringComp-29.4 {string cat, many args} {
    proc foo {} {
	set x FOO
	set n 260
	set xx [string repeat $x $n]
	set vv [string repeat {$x} $n]
	set vvs [string repeat {$x } $n]
	set r1 [string compare $xx [subst $vv]]
	set r2 [string compare $xx [eval "string cat $vvs"]]
	list $r1 $r2
    }
    foo
} {0 0}


# cleanup
catch {rename foo {}}
::tcltest::cleanupTests
return

# Local Variables:
# mode: tcl
# End: