xref: /openbsd/gnu/usr.bin/perl/t/op/join.t (revision 6f40fd34) 
1#!./perl
2
3BEGIN {
4    chdir 't' if -d 't';
5    @INC = '../lib';
6    require './test.pl';
7}
8
9plan tests => 29;
10
11@x = (1, 2, 3);
12is( join(':',@x), '1:2:3', 'join an array with character');
13
14is( join('',1,2,3), '123', 'join list with no separator');
15
16is( join(':',split(/ /,"1 2 3")), '1:2:3', 'join implicit array with character');
17
18my $f = 'a';
19$f = join ',', 'b', $f, 'e';
20is( $f, 'b,a,e', 'join list back to self, middle of list');
21
22$f = 'a';
23$f = join ',', $f, 'b', 'e';
24is( $f, 'a,b,e', 'join list back to self, beginning of list');
25
26$f = 'a';
27$f = join $f, 'b', 'e', 'k';
28is( $f, 'baeak', 'join back to self, self is join character');
29
30# 7,8 check for multiple read of tied objects
31{ package X;
32  sub TIESCALAR { my $x = 7; bless \$x };
33  sub FETCH { my $y = shift; $$y += 5 };
34  tie my $t, 'X';
35  my $r = join ':', $t, 99, $t, 99;
36  main::is($r, '12:99:17:99', 'check for multiple read of tied objects, with separator');
37  $r = join '', $t, 99, $t, 99;
38  main::is($r, '22992799', 'check for multiple read of tied objects, w/o separator, and magic');
39};
40
41# 9,10 and for multiple read of undef
42{ my $s = 5;
43  local ($^W, $SIG{__WARN__}) = ( 1, sub { $s+=4 } );
44  my $r = join ':', 'a', undef, $s, 'b', undef, $s, 'c';
45  is( $r, 'a::9:b::13:c', 'multiple read of undef, with separator');
46  my $r = join '', 'a', undef, $s, 'b', undef, $s, 'c';
47  is( $r, 'a17b21c', '... and without separator');
48};
49
50{ my $s = join("", chr(0x1234), chr(0xff));
51  is( $s, "\x{1234}\x{ff}", 'join two characters with multiple bytes, get two characters');
52}
53
54{ my $s = join(chr(0xff), chr(0x1234), "");
55  is( $s, "\x{1234}\x{ff}", 'high byte character as separator, 1 multi-byte character in front');
56}
57
58{ my $s = join(chr(0x1234), chr(0xff), chr(0x2345));
59  is( $s, "\x{ff}\x{1234}\x{2345}", 'multibyte character as separator');
60}
61
62{ my $s = join(chr(0xff), chr(0x1234), chr(0xfe));
63  is( $s, "\x{1234}\x{ff}\x{fe}", 'high byte as separator, multi-byte and high byte list');
64}
65
66{ my $s = join('x', ());
67  is( $s, '', 'join should return empty string for empty list');
68}
69
70{ my $s = join('', ());
71  is( $s, '', 'join should return empty string for empty list and empty separator as well');
72}
73
74{ my $w;
75  local $SIG{__WARN__} = sub { $w = shift };
76  use warnings "uninitialized";
77  my $s = join(undef, ());
78  is( $s, '', 'join should return empty string for empty list, when separator is undef');
79  # this warning isn't normative, the implementation may choose to
80  # not evaluate the separator as a string if the list has fewer than
81  # two elements
82  like $w, qr/^Use of uninitialized value in join/, "should warn if separator is undef";
83}
84
85
86{ # [perl #24846] $jb2 should be in bytes, not in utf8.
87  my $b = "abc\304";
88  my $u = "abc\x{0100}";
89
90  sub join_into_my_variable {
91    my $r = join("", @_);
92    return $r;
93  }
94
95  sub byte_is {
96    use bytes;
97    return $_[0] eq $_[1] ? pass($_[2]) : fail($_[2]);
98  }
99
100  my $jb1 = join_into_my_variable("", $b);
101  my $ju1 = join_into_my_variable("", $u);
102  my $jb2 = join_into_my_variable("", $b);
103  my $ju2 = join_into_my_variable("", $u);
104
105  note( 'utf8 and byte checks, perl #24846' );
106
107  byte_is($jb1, $b);
108  is( $jb1, $b );
109
110  byte_is($ju1, $u);
111  is( $ju1, $u );
112
113  byte_is($jb2, $b);
114  is( $jb2, $b );
115
116  byte_is($ju2, $u);
117  is( $ju2, $u );
118}
119
120package o { use overload q|""| => sub { ${$_[0]}++ } }
121{
122  my $o = bless \(my $dummy = "a"), o::;
123  $_ = join $o, 1..10;
124  is $_, "1a2a3a4a5a6a7a8a9a10", 'join, $overloaded, LIST';
125  is $$o, "b", 'overloading was called once on overloaded separator';
126}
127
128for(1,2) { push @_, \join "x", 1 }
129isnt $_[1], $_[0],
130    'join(const, const) still returns a new scalar each time';
131