add some test cases to show that undef invocants are handled too

diff --git a/t/safe_isa.t b/t/safe_isa.t
index f9721e1..837f3c4 100644 (file)
--- a/t/safe_isa.t
+++ b/t/safe_isa.t
@@ -1,6 +1,6 @@
 use strict;
 use warnings FATAL => 'all';
-use Test::More tests => 15;
+use Test::More tests => 20;
 
 { package Foo; sub new { bless({}, $_[0]) } }
 { package Bar; our @ISA = qw(Foo); sub bar { 1 } }
@@ -8,27 +8,34 @@ use Test::More tests => 15;
 my $foo = Foo->new;
 my $bar = Bar->new;
 my $blam = [ 42 ];
+my $undef;
 
 # basic isa usage -
 
 ok($foo->isa('Foo'), 'foo isa Foo');
 ok($bar->isa('Foo'), 'bar isa Foo');
 ok(!eval { $blam->isa('Foo'); 1 }, 'blam goes blam');
+ok(!eval { $undef->isa('Foo'); 1 }, 'undef goes poof');
+
 
 ok(!$foo->can('bar'), 'foo !can bar');
 ok($bar->can('bar'), 'bar can bar');
 ok(!eval { $blam->can('bar'); 1 }, 'blam goes blam');
+ok(!eval { $undef->can('bar'); 1 }, 'undef goes poof');
 
 use Safe::Isa;
 
 ok($foo->$_isa('Foo'), 'foo $_isa Foo');
 ok($bar->$_isa('Foo'), 'bar $_isa Foo');
 ok(eval { $blam->$_isa('Foo'); 1 }, 'no boom today');
+ok(eval { $undef->$_isa('Foo'); 1 }, 'nor tomorrow either');
 
 ok(!$foo->$_can('bar'), 'foo !$_can bar');
 ok($bar->$_can('bar'), 'bar $_can bar');
 ok(eval { $blam->$_can('bar'); 1 }, 'no boom today');
+ok(eval { $undef->$_can('bar'); 1 }, 'nor tomorrow either');
 
 ok($foo->$_call_if_object(isa => 'Foo'), 'foo $_call_if_object(isa => Foo)');
 ok($bar->$_call_if_object(isa => 'Foo'), 'bar $_call_if_object(isa => Foo)');
 ok(eval { $blam->$_call_if_object(isa => 'Foo'); 1 }, 'no boom today');
+ok(eval { $undef->$_call_if_object(isa => 'Foo'); 1 }, 'nor tomorrow either');