Set $_[2] to the default length for len magic on scalars

[perl/modules/Variable-Magic.git] / t / 22-len.t

diff --git a/t/22-len.t b/t/22-len.t
index 5d3ae92220c660e012ef1f9fcbfe8ed0f7354d40..3b8039efc1f926af430c4c5da0eda14235d5aa19 100644 (file)
--- a/t/22-len.t
+++ b/t/22-len.t
@@ -3,14 +3,15 @@
 use strict;
 use warnings;
 
-use Test::More tests => 13;
+use Test::More tests => 33;
 
 use Variable::Magic qw/wizard cast VMG_COMPAT_SCALAR_LENGTH_NOLEN/;
 
 my $c = 0;
 
 my $n = 1 + int rand 1000;
-my $wiz = wizard len => sub { ++$c; return $n };
+my $d;
+my $wiz = wizard len => sub { $d = $_[2]; ++$c; return $n };
 is $c, 0, 'len: wizard() doesn\'t trigger magic';
 
 my @a = qw/a b c/;
@@ -20,46 +21,106 @@ cast @a, $wiz;
 is $c, 0, 'len: cast on array doesn\'t trigger magic';
 
 $c = 0;
+$d = undef;
 my $b = scalar @a;
 is $c, 1,  'len: get array length triggers magic correctly';
+is $d, 3,  'len: get array length have correct default length';
 is $b, $n, 'len: get array length correctly';
 
 $c = 0;
+$d = undef;
 $b = $#a;
 is $c, 1,      'len: get last array index triggers magic correctly';
+is $d, 3,      'len: get last array index have correct default length';
 is $b, $n - 1, 'len: get last array index correctly';
 
 $n = 0;
 
 $c = 0;
+$d = undef;
 $b = scalar @a;
 is $c, 1, 'len: get array length 0 triggers magic correctly';
+is $d, 3, 'len: get array length 0 have correct default length';
 is $b, 0, 'len: get array length 0 correctly';
 
+$n = undef;
+@a = ();
+cast @a, $wiz;
+
+$c = 0;
+$d = undef;
+$b = scalar @a;
+is $c, 1, 'len: get empty array length triggers magic correctly';
+is $d, 0, 'len: get empty array length have correct default length';
+is $b, 0, 'len: get empty array length correctly';
+
+$c = 0;
+$d = undef;
+$b = $#a;
+is $c, 1,  'len: get last empty array index triggers magic correctly';
+is $d, 0,  'len: get last empty array index have correct default length';
+is $b, -1, 'len: get last empty array index correctly';
+
 SKIP: {
- skip 'length() no longer calls mg_len magic' => 5 if VMG_COMPAT_SCALAR_LENGTH_NOLEN;
+ skip 'length() no longer calls mg_len magic' => 16 if VMG_COMPAT_SCALAR_LENGTH_NOLEN;
 
  $c = 0;
  $n = 1 + int rand 1000;
  # length magic on scalars needs also get magic to be triggered.
  $wiz = wizard get => sub { return 'anything' },
-               len => sub { ++$c; return $n };
+               len => sub { $d = $_[2]; ++$c; return $n };
 
- my $x = int rand 1000;
+ my $x = 6789;
 
  $c = 0;
  cast $x, $wiz;
  is $c, 0, 'len: cast on scalar doesn\'t trigger magic';
 
  $c = 0;
+ $d = undef;
  $b = length $x;
  is $c, 1,  'len: get scalar length triggers magic correctly';
+ is $d, 4,  'len: get scalar length have correct default length';
  is $b, $n, 'len: get scalar length correctly';
 
  $n = 0;
 
  $c = 0;
+ $d = undef;
  $b = length $x;
  is $c, 1,  'len: get scalar length 0 triggers magic correctly';
+ is $d, 4,  'len: get scalar length 0 have correct default length';
  is $b, $n, 'len: get scalar length 0 correctly';
+
+ $n = undef;
+ $x = '';
+ cast $x, $wiz;
+
+ $c = 0;
+ $d = undef;
+ $b = length $x;
+ is $c, 1, 'len: get empty scalar length triggers magic correctly';
+ is $d, 0, 'len: get empty scalar length have correct default length';
+ is $b, 0, 'len: get empty scalar length correctly';
+
+ $x = "\x{20AB}ongs";
+ cast $x, $wiz;
+
+ {
+  use bytes;
+
+  $c = 0;
+  $d = undef;
+  $b = length $x;
+  is $c, 1,  'len: get utf8 scalar length in bytes triggers magic correctly';
+  is $d, 7,  'len: get utf8 scalar length in bytes have correct default length';
+  is $b, $d, 'len: get utf8 scalar length in bytes correctly';
+ }
+
+ $c = 0;
+ $d = undef;
+ $b = length $x;
+ is $c, 1,  'len: get utf8 scalar length triggers magic correctly';
+ is $d, 5,  'len: get utf8 scalar length have correct default length';
+ is $b, $d, 'len: get utf8 scalar length correctly';
 }