16 print "not " unless $a->isa("Bob");
28 sub drink { return "drinking " . $_[1] }
31 $Alice::VERSION = 2.718;
49 sub test { print "not " unless shift; print "ok $i\n"; $i++; }
54 test $a->isa("Alice");
58 test $a->isa("Female");
60 test $a->isa("Human");
62 test ! $a->isa("Male");
64 test ! $a->isa('Programmer');
67 test ! $a->can("sleep");
68 test my $ref = $a->can("drink"); # returns a coderef
69 test $a->$ref("tea") eq "drinking tea"; # ... which works
70 test $ref = $a->can("sing");
72 test $@; # ... but not if no actual subroutine
74 test (!Cedric->isa('Programmer'));
76 test (Cedric->isa('Human'));
78 push(@Cedric::ISA,'Programmer');
80 test (Cedric->isa('Programmer'));
84 base::->import('Programmer');
87 test $a->isa('Programmer');
88 test $a->isa("Female");
90 @Cedric::ISA = qw(Bob);
92 test (!Cedric->isa('Programmer'));
95 my @refs = qw(SCALAR SCALAR LVALUE GLOB ARRAY HASH CODE);
96 my @vals = ( \$b, \3.14, \substr($b,1,1), \*b, [], {}, sub {} );
97 for ($p=0; $p < @refs; $p++) {
98 for ($q=0; $q < @vals; $q++) {
99 test UNIVERSAL::isa($vals[$p], $refs[$q]) eq ($p==$q or $p+$q==1);
103 test ! UNIVERSAL::can(23, "can");
105 test $a->can("VERSION");
108 test ! $a->can("export_tags"); # a method in Exporter
110 test (eval { $a->VERSION }) == 2.718;
112 test ! (eval { $a->VERSION(2.719) }) &&
113 $@ =~ /^Alice version 2.71(?:9|8999\d+) required--this is only version 2.718 at /;
115 test (eval { $a->VERSION(2.718) }) && ! $@;
117 my $subs = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
119 test $subs eq "can isa VERSION";
121 test $subs eq "VERSION can isa";
124 test $a->isa("UNIVERSAL");
126 test ! UNIVERSAL::isa([], "UNIVERSAL");
128 test ! UNIVERSAL::can({}, "can");
130 test UNIVERSAL::isa(Alice => "UNIVERSAL");
132 test UNIVERSAL::can(Alice => "can") == \&UNIVERSAL::can;
134 # now use UNIVERSAL.pm and see what changes
135 eval "use UNIVERSAL";
137 test $a->isa("UNIVERSAL");
139 my $sub2 = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
140 # XXX import being here is really a bug
142 test $sub2 eq "can import isa VERSION";
144 test $sub2 eq "VERSION can import isa";
147 eval 'sub UNIVERSAL::sleep {}';
148 test $a->can("sleep");
150 test ! UNIVERSAL::can($b, "can");
152 test ! $a->can("export_tags"); # a method in Exporter
154 test ! UNIVERSAL::isa("\xff\xff\xff\0", 'HASH');