archie/tcl7.6/tests/while.test

# Commands covered:  while
#
# 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.
#
# Copyright (c) 1991-1993 The Regents of the University of California.
# Copyright (c) 1994 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: @(#) while.test 1.9 96/02/16 08:56:37

if {[string compare test [info procs test]] == 1} then {source defs}

test while-1.1 {basic while loops} {
    set count 0
    while {$count < 10} {set count [expr $count+1]}
    set count
} 10
test while-1.2 {basic while loops} {
    set value xxx
    while {2 > 3} {set value yyy}
    set value
} xxx
test while-1.3 {basic while loops} {
    set value 1
    while {"true"} {
	incr value;
	if {$value > 5} {
	    break;
	}
    }
    set value
} 6

test while-2.1 {continue in while loop} {
    set list {1 2 3 4 5}
    set index 0
    set result {}
    while {$index < 5} {
	if {$index == 2} {set index [expr $index+1]; continue}
	set result [concat $result [lindex $list $index]]
	set index [expr $index+1]
    }
    set result
} {1 2 4 5}

test while-3.1 {break in while loop} {
    set list {1 2 3 4 5}
    set index 0
    set result {}
    while {$index < 5} {
	if {$index == 3} break
	set result [concat $result [lindex $list $index]]
	set index [expr $index+1]
    }
    set result
} {1 2 3}

test while-4.1 {errors in while loops} {
    set err [catch {while} msg]
    list $err $msg
} {1 {wrong # args: should be "while test command"}}
test while-4.2 {errors in while loops} {
    set err [catch {while 1} msg]
    list $err $msg
} {1 {wrong # args: should be "while test command"}}
test while-4.3 {errors in while loops} {
    set err [catch {while 1 2 3} msg]
    list $err $msg
} {1 {wrong # args: should be "while test command"}}
test while-4.4 {errors in while loops} {
    set err [catch {while {"a"+"b"} {error "loop aborted"}} msg]
    list $err $msg
} {1 {can't use non-numeric string as operand of "+"}}
test while-4.5 {errors in while loops} {
    set x 1
    set err [catch {while {$x} {set x foo}} msg]
    list $err $msg
} {1 {expected boolean value but got "foo"}}
test while-4.6 {errors in while loops} {
    set err [catch {while {1} {error "loop aborted"}} msg]
    list $err $msg $errorInfo
} {1 {loop aborted} {loop aborted
    while executing
"error "loop aborted""
    ("while" body line 1)
    invoked from within
"while {1} {error "loop aborted"}"}}

test while-5.1 {while return result} {
    while {0} {set a 400}
} {}
test while-5.2 {while return result} {
    set x 1
    while {$x} {set x 0}
} {}