1#!./perl
2
3use strict;
4use warnings;
5
6use List::Util qw(head tail);
7use Test::More;
8plan tests => 42;
9
10my @ary;
11
12ok(defined &head, 'defined');
13ok(defined &tail, 'defined');
14
15@ary = head 1, ( 4, 5, 6 );
16is( scalar @ary, 1 );
17is( $ary[0], 4 );
18
19@ary = head 2, ( 4, 5, 6 );
20is( scalar @ary, 2 );
21is( $ary[0], 4 );
22is( $ary[1], 5 );
23
24@ary = head -1, ( 4, 5, 6 );
25is( scalar @ary, 2 );
26is( $ary[0], 4 );
27is( $ary[1], 5 );
28
29@ary = head -2, ( 4, 5, 6 );
30is( scalar @ary, 1 );
31is( $ary[0], 4 );
32
33@ary = head 999, ( 4, 5, 6 );
34is( scalar @ary, 3 );
35is( $ary[0], 4 );
36is( $ary[1], 5 );
37is( $ary[2], 6 );
38
39@ary = head 0, ( 4, 5, 6 );
40is( scalar @ary, 0 );
41
42@ary = head 0;
43is( scalar @ary, 0 );
44
45@ary = head 5;
46is( scalar @ary, 0 );
47
48@ary = head -3, ( 4, 5, 6 );
49is( scalar @ary, 0 );
50
51@ary = head -999, ( 4, 5, 6 );
52is( scalar @ary, 0 );
53
54eval '@ary = head';
55like( $@, qr{^Not enough arguments for List::Util::head} );
56
57@ary = head 4, ( 4, 5, 6 );
58is( scalar @ary, 3 );
59is( $ary[0], 4 );
60is( $ary[1], 5 );
61is( $ary[2], 6 );
62
63@ary = tail 1, ( 4, 5, 6 );
64is( scalar @ary, 1 );
65is( $ary[0], 6 );
66
67@ary = tail 2, ( 4, 5, 6 );
68is( scalar @ary, 2 );
69is( $ary[0], 5 );
70is( $ary[1], 6 );
71
72@ary = tail -1, ( 4, 5, 6 );
73is( scalar @ary, 2 );
74is( $ary[0], 5 );
75is( $ary[1], 6 );
76
77@ary = tail -2, ( 4, 5, 6 );
78is( scalar @ary, 1 );
79is( $ary[0], 6 );
80
81@ary = tail 0, ( 4, 5, 6 );
82is( scalar @ary, 0 );
83
84@ary = tail 0;
85is( scalar @ary, 0 );
86
87@ary = tail 5;
88is( scalar @ary, 0 );
89
90@ary = tail -3;
91is( scalar @ary, 0 );
92
93@ary = tail -999;
94is( scalar @ary, 0 );
95
96eval '@ary = tail';
97like( $@, qr{^Not enough arguments for List::Util::tail} );
98