Commit | Line | Data |
---|---|---|
a758b0b5 MHM |
1 | #!./perl -w |
2 | ||
3 | BEGIN { | |
4 | chdir 't' if -d 't'; | |
5 | @INC = '../lib'; | |
6 | require './test.pl'; | |
7 | } | |
8 | ||
85b7d9b3 | 9 | plan tests => 24; |
a758b0b5 | 10 | |
1b293ed1 | 11 | # not() tests |
877c9ac8 JK |
12 | pass("logical negation of empty list") if not(); |
13 | is(not(), 1, "logical negation of empty list in numeric comparison"); | |
14 | is(not(), not(0), | |
15 | "logical negation of empty list compared with logical negation of false value"); | |
1b293ed1 SP |
16 | |
17 | # test not(..) and ! | |
877c9ac8 JK |
18 | note("parens needed around second argument in next two tests\nto preserve list context inside function call"); |
19 | is(! 1, (not 1), | |
20 | "high- and low-precedence logical negation of true value"); | |
21 | is(! 0, (not 0), | |
22 | "high- and low-precedence logical negation of false value"); | |
23 | is(! (0, 0), not(0, 0), | |
24 | "high- and low-precedence logical negation of lists"); | |
1b293ed1 SP |
25 | |
26 | # test the return of ! | |
27 | { | |
28 | my $not0 = ! 0; | |
29 | my $not1 = ! 1; | |
30 | ||
31 | no warnings; | |
877c9ac8 JK |
32 | ok($not1 == undef, |
33 | "logical negation (high-precedence) of true value is numerically equal to undefined value"); | |
34 | ok($not1 == (), | |
35 | "logical negation (high-precedence) of true value is numerically equal to empty list"); | |
1b293ed1 SP |
36 | |
37 | use warnings; | |
877c9ac8 JK |
38 | ok($not1 eq '', |
39 | "logical negation (high-precedence) of true value in string context is equal to empty string"); | |
40 | ok($not1 == 0, | |
41 | "logical negation (high-precedence) of true value is false in numeric context"); | |
42 | ok($not0 == 1, | |
43 | "logical negation (high-precedence) of false value is true in numeric context"); | |
1b293ed1 SP |
44 | } |
45 | ||
46 | # test the return of not | |
47 | { | |
48 | my $not0 = not 0; | |
49 | my $not1 = not 1; | |
50 | ||
51 | no warnings; | |
877c9ac8 JK |
52 | ok($not1 == undef, |
53 | "logical negation (low-precedence) of true value is numerically equal to undefined value"); | |
54 | ok($not1 == (), | |
55 | "logical negation (low-precedence) of true value is numerically equal to empty list"); | |
1b293ed1 SP |
56 | |
57 | use warnings; | |
877c9ac8 JK |
58 | ok($not1 eq '', |
59 | "logical negation (low-precedence) of true value in string context is equal to empty string"); | |
60 | ok($not1 == 0, | |
61 | "logical negation (low-precedence) of true value is false in numeric context"); | |
62 | ok($not0 == 1, | |
63 | "logical negation (low-precedence) of false value is true in numeric context"); | |
1b293ed1 | 64 | } |
762dbf22 FC |
65 | |
66 | # test truth of dualvars | |
67 | SKIP: | |
68 | { | |
69 | my $got_dualvar; | |
70 | eval 'use Scalar::Util "dualvar"; $got_dualvar++'; | |
71 | skip "No Scalar::Util::dualvar", 3 unless $got_dualvar; | |
72 | my $a = Scalar::Util::dualvar(3, ""); | |
73 | is not($a), 1, 'not(dualvar) ignores int when string is false'; | |
74 | my $b = Scalar::Util::dualvar(3.3,""); | |
75 | is not($b), 1, 'not(dualvar) ignores float when string is false'; | |
76 | my $c = Scalar::Util::dualvar(0,"1"); | |
77 | is not($c), "", 'not(dualvar) ignores false int when string is true'; | |
78 | } | |
95c52ddd | 79 | |
85b7d9b3 FC |
80 | # test truth of regexps |
81 | is not(${qr//}), "", 'dereferenced regexps are true'; | |
82 | ||
95c52ddd FC |
83 | # not’s return value should be read-only, as it is the same global scalar |
84 | # each time (and test that it is, too). | |
85 | *yes = \not 0; | |
86 | *no = \not 1; | |
87 | for (!0) { eval { $_ = 43 } } | |
88 | like $@, qr/^Modification of a read-only value attempted at /, | |
89 | 'not 0 is read-only'; | |
90 | for (!1) { eval { $_ = 43 } } | |
91 | like $@, qr/^Modification of a read-only value attempted at /, | |
92 | 'not 1 is read-only'; | |
93 | require Config; | |
95c52ddd FC |
94 | is \!0, \$yes, '!0 returns the same value each time [perl #114838]'; |
95 | is \!1, \$no, '!1 returns the same value each time [perl #114838]'; |