X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/ee8c7f5465f003860e2347a2946abacac39bd9b9..444e39b5b9f36cd0f60283ca4c60fc108157921f:/t/op/universal.t

diff --git a/t/op/universal.t b/t/op/universal.t
index a0a74ec..efda2a5 100755
--- a/t/op/universal.t
+++ b/t/op/universal.t
@@ -5,11 +5,11 @@
 
 BEGIN {
     chdir 't' if -d 't';
-    unshift @INC, '../lib' if -d '../lib';
+    @INC = '../lib';
     $| = 1;
 }
 
-print "1..80\n";
+print "1..87\n";
 
 $a = {};
 bless $a, "Bob";
@@ -24,7 +24,8 @@ package Female;
 
 package Alice;
 @ISA=qw(Bob Female);
-sub drink {}
+sub sing;
+sub drink { return "drinking " . $_[1]  }
 sub new { bless {} }
 
 $Alice::VERSION = 2.718;
@@ -44,8 +45,9 @@ $Alice::VERSION = 2.718;
 
 package main;
 
-my $i = 2;
-sub test { print "not " unless shift; print "ok $i\n"; $i++; }
+{ my $i = 2;
+  sub test { print "not " unless shift; print "ok $i\n"; $i++; }
+}
 
 $a = new Alice;
 
@@ -61,11 +63,13 @@ test ! $a->isa("Male");
 
 test ! $a->isa('Programmer');
 
-test $a->can("drink");
-
 test $a->can("eat");
-
 test ! $a->can("sleep");
+test my $ref = $a->can("drink");        # returns a coderef
+test $a->$ref("tea") eq "drinking tea"; # ... which works
+test $ref = $a->can("sing");
+eval { $a->$ref() };
+test $@;                                # ... but not if no actual subroutine
 
 test (!Cedric->isa('Programmer'));
 
@@ -119,6 +123,14 @@ if ('a' lt 'A') {
 
 test $a->isa("UNIVERSAL");
 
+test ! UNIVERSAL::isa([], "UNIVERSAL");
+
+test ! UNIVERSAL::can({}, "can");
+
+test UNIVERSAL::isa(Alice => "UNIVERSAL");
+
+test UNIVERSAL::can(Alice => "can") == \&UNIVERSAL::can;
+
 # now use UNIVERSAL.pm and see what changes
 eval "use UNIVERSAL";