[ PATCH] Re: isa(UNIVERSAL)?

[perl5.git] / t / op / universal.t

diff --git a/t/op/universal.t b/t/op/universal.t
index 03f0fbd..71daf67 100755 (executable)
--- a/t/op/universal.t
+++ b/t/op/universal.t
@@ -3,7 +3,13 @@
 # check UNIVERSAL
 #
 
-print "1..11\n";
+BEGIN {
+    chdir 't' if -d 't';
+    @INC = '../lib';
+    $| = 1;
+}
+
+print "1..100\n";
 
 $a = {};
 bless $a, "Bob";
@@ -18,38 +24,174 @@ package Female;
 
 package Alice;
 @ISA=qw(Bob Female);
-sub drink {}
+sub sing;
+sub drink { return "drinking " . $_[1]  }
 sub new { bless {} }
 
+$Alice::VERSION = 2.718;
+
+{
+    package Cedric;
+    our @ISA;
+    use base qw(Human);
+}
+
+{
+    package Programmer;
+    our $VERSION = 1.667;
+
+    sub write_perl { 1 }
+}
+
 package main;
+
+{ my $i = 2;
+  sub test {
+      print "not " unless $_[0];
+      print "ok ", $i++;
+      print " # at ", (caller)[1], ", line ", (caller)[2] unless $_[0];
+      print "\n";
+  }
+}
+
 $a = new Alice;
 
-print "not " unless $a->isa("Alice");
-print "ok 2\n";
+test $a->isa("Alice");
+test $a->isa("main::Alice");    # check that alternate class names work
 
-print "not " unless $a->isa("Bob");
-print "ok 3\n";
+test(("main::Alice"->new)->isa("Alice"));
+
+test $a->isa("Bob");
+test $a->isa("main::Bob");
+
+test $a->isa("Female");
+
+test $a->isa("Human");
+
+test ! $a->isa("Male");
+
+test ! $a->isa('Programmer');
+
+test $a->isa("HASH");
+
+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'));
+
+test (Cedric->isa('Human'));
+
+push(@Cedric::ISA,'Programmer');
+
+test (Cedric->isa('Programmer'));
+
+{
+    package Alice;
+    base::->import('Programmer');
+}
+
+test $a->isa('Programmer');
+test $a->isa("Female");
+
+@Cedric::ISA = qw(Bob);
+
+test (!Cedric->isa('Programmer'));
+
+my $b = 'abc';
+my @refs = qw(SCALAR SCALAR     LVALUE      GLOB ARRAY HASH CODE);
+my @vals = (  \$b,   \3.14, \substr($b,1,1), \*b,  [],  {}, sub {} );
+for ($p=0; $p < @refs; $p++) {
+    for ($q=0; $q < @vals; $q++) {
+        test UNIVERSAL::isa($vals[$p], $refs[$q]) eq ($p==$q or $p+$q==1);
+    };
+};
+
+test ! UNIVERSAL::can(23, "can");
+
+test $a->can("VERSION");
+
+test $a->can("can");
+test ! $a->can("export_tags"); # a method in Exporter
+
+test (eval { $a->VERSION }) == 2.718;
+
+test ! (eval { $a->VERSION(2.719) }) &&
+         $@ =~ /^Alice version 2.71(?:9|8999\d+) required--this is only version 2.718 at /;
+
+test (eval { $a->VERSION(2.718) }) && ! $@;
+
+my $subs = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
+## The test for import here is *not* because we want to ensure that UNIVERSAL
+## can always import; it is an historical accident that UNIVERSAL can import.
+if ('a' lt 'A') {
+    test $subs eq "can import isa VERSION";
+} else {
+    test $subs eq "VERSION can import isa";
+}
+
+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";
+
+test $a->isa("UNIVERSAL");
+
+my $sub2 = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
+# XXX import being here is really a bug
+if ('a' lt 'A') {
+    test $sub2 eq "can import isa VERSION";
+} else {
+    test $sub2 eq "VERSION can import isa";
+}
+
+eval 'sub UNIVERSAL::sleep {}';
+test $a->can("sleep");
 
-print "not " unless $a->isa("Female");
-print "ok 4\n";
+test ! UNIVERSAL::can($b, "can");
 
-print "not " unless $a->isa("Human");
-print "ok 5\n";
+test ! $a->can("export_tags"); # a method in Exporter
 
-print "not " if $a->isa("Male");
-print "ok 6\n";
+test ! UNIVERSAL::isa("\xff\xff\xff\0", 'HASH');
 
-print "not " unless $a->can("drink");
-print "ok 7\n";
+{
+    package Pickup;
+    use UNIVERSAL qw( isa can VERSION );
 
-print "not " unless $a->can("eat");
-print "ok 8\n";
+    main::test isa "Pickup", UNIVERSAL;
+    main::test can( "Pickup", "can" ) == \&UNIVERSAL::can;
+    main::test VERSION "UNIVERSAL" ;
+}
 
-print "not " if $a->can("sleep");
-print "ok 9\n";
+{
+    # test isa() and can() on magic variables
+    "Human" =~ /(.*)/;
+    test $1->isa("Human");
+    test $1->can("eat");
+    package HumanTie;
+    sub TIESCALAR { bless {} }
+    sub FETCH { "Human" }
+    tie my($x), "HumanTie";
+    ::test $x->isa("Human");
+    ::test $x->can("eat");
+}
 
-print "not " unless UNIVERSAL::isa([], "ARRAY");
-print "ok 10\n";
+# bugid 3284
+# a second call to isa('UNIVERSAL') when @ISA is null failed due to caching
 
-print "not " unless UNIVERSAL::isa({}, "HASH");
-print "ok 11\n";
+@X::ISA=();
+my $x = {}; bless $x, 'X';
+test $x->isa('UNIVERSAL');
+test $x->isa('UNIVERSAL');