Add tests for sizing magic.

[p5sagit/Devel-Size.git] / t / magic.t

diff --git a/t/magic.t b/t/magic.t
new file mode 100644 (file)
index 0000000..d0f5b73
--- /dev/null
+++ b/t/magic.t
@@ -0,0 +1,33 @@
+#!/usr/bin/perl -w
+
+use strict;
+use Test::More tests => 7;
+use Devel::Size ':all';
+require Tie::Scalar;
+
+{
+    my $string = 'Perl Rules';
+    my $before_size = total_size($string);
+    is($string =~ /Perl/g, 1, 'It had better match');
+    cmp_ok($before_size, '>', length $string,
+          'Our string has a non-zero length');
+    cmp_ok(total_size($string), '>', $before_size,
+          'size increases due to magic');
+}
+
+{
+    my $string = 'Perl Rules';
+    my $before_size = total_size($string);
+    formline $string;
+    my $compiled_size = total_size($string);
+    cmp_ok($before_size, '>', length $string,
+          'Our string has a non-zero length');
+    cmp_ok($compiled_size, '>', $before_size,
+          'size increases due to magic (and the compiled state)');
+    # Not fully sure why (didn't go grovelling) but need to use a temporary to
+    # avoid the magic being copied.
+    $string = '' . $string;
+    my $after_size = total_size($string);
+    cmp_ok($after_size, '>', $before_size, 'Still larger than initial size');
+    cmp_ok($after_size, '<', $compiled_size, 'size decreases due to unmagic');
+}