# check UNIVERSAL
#
-print "1..11\n";
+BEGIN {
+ chdir 't' if -d 't';
+ @INC = '../lib';
+ $| = 1;
+}
+
+print "1..98\n";
$a = {};
bless $a, "Bob";
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");
-print "not " unless $a->isa("Female");
-print "ok 4\n";
+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";
+}
-print "not " unless $a->isa("Human");
-print "ok 5\n";
+eval 'sub UNIVERSAL::sleep {}';
+test $a->can("sleep");
-print "not " if $a->isa("Male");
-print "ok 6\n";
+test ! UNIVERSAL::can($b, "can");
-print "not " unless $a->can("drink");
-print "ok 7\n";
+test ! $a->can("export_tags"); # a method in Exporter
-print "not " unless $a->can("eat");
-print "ok 8\n";
+test ! UNIVERSAL::isa("\xff\xff\xff\0", 'HASH');
-print "not " if $a->can("sleep");
-print "ok 9\n";
+{
+ package Pickup;
+ use UNIVERSAL qw( isa can VERSION );
-print "not " unless UNIVERSAL::isa([], "ARRAY");
-print "ok 10\n";
+ main::test isa "Pickup", UNIVERSAL;
+ main::test can( "Pickup", "can" ) == \&UNIVERSAL::can;
+ main::test VERSION "UNIVERSAL" ;
+}
-print "not " unless UNIVERSAL::isa({}, "HASH");
-print "ok 11\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");
+}