Allow passing ref-to-undef as callbacks to install a noop callback

[perl/modules/Variable-Magic.git] / t / 27-local.t

diff --git a/t/27-local.t b/t/27-local.t
index 086d619d9a081d7cf8ac79403e26ef83851204de..ca557e13d73cf4692e897bb39f68d356a09131df 100644 (file)
--- a/t/27-local.t
+++ b/t/27-local.t
@@ -5,10 +5,10 @@ use warnings;
 
 use Test::More;
 
-use Variable::Magic qw<cast MGf_LOCAL>;
+use Variable::Magic qw<wizard cast getdata MGf_LOCAL>;
 
 if (MGf_LOCAL) {
- plan tests => 2 * 3 + 1 + 1;
+ plan tests => 2 * 3 + 1 + (2 + 2 * 7) + 1;
 } else {
  plan skip_all => 'No local magic for this perl';
 }
@@ -24,3 +24,50 @@ my $res = watch { cast $a, $wiz } { }, 'cast';
 ok $res, 'local: cast succeeded';
 
 watch { local $a } { local => 1 }, 'localized';
+
+{
+ local $@;
+
+ my $w1 = eval { wizard local => \undef, data => sub { 'w1' } };
+ is $@, '', 'local: noop wizard creation does not croak';
+ my $w2 = eval { wizard data => sub { 'w2' } };
+ is $@, '', 'local: dummy wizard creation does not croak';
+
+ {
+  our $u;
+  eval { cast $u, $w1 };
+  is $@,               '',   'local: noop magic (first) cast does not croak';
+  is getdata($u, $w1), 'w1', 'local: noop magic (first) cast succeeded';
+  eval { cast $u, $w2 };
+  is $@,               '',   'local: dummy magic (second) cast does not croak';
+  is getdata($u, $w2), 'w2', 'local: dummy magic (second) cast succeeded';
+  my ($z1, $z2);
+  eval {
+   local $u = '';
+   $z1 = getdata $u, $w1;
+   $z2 = getdata $u, $w2;
+  };
+  is $@, '',     'local: noop/dummy magic invocation does not croak';
+  is $z1, undef, 'local: noop magic (first) prevented magic copy';
+  is $z2, 'w2',  'local: dummy magic (second) was copied';
+ }
+
+ {
+  our $v;
+  eval { cast $v, $w2 };
+  is $@,               '',   'local: dummy magic (first) cast does not croak';
+  is getdata($v, $w2), 'w2', 'local: dummy magic (first) cast succeeded';
+  eval { cast $v, $w1 };
+  is $@,               '',   'local: noop magic (second) cast does not croak';
+  is getdata($v, $w1), 'w1', 'local: noop magic (second) cast succeeded';
+  my ($z1, $z2);
+  eval {
+   local $v = '';
+   $z1 = getdata $v, $w1;
+   $z2 = getdata $v, $w2;
+  };
+  is $@, '',     'local: dummy/noop magic invocation does not croak';
+  is $z2, 'w2',  'local: dummy magic (first) was copied';
+  is $z1, undef, 'local: noop magic (second) prevented magic copy';
+ }
+}