+#!./perl
+#
+# check UNIVERSAL
+#
+
+BEGIN {
+ chdir 't' if -d 't';
+ @INC = '../lib';
+ $| = 1;
+ require "./test.pl";
+}
+
+plan tests => 143;
+
+$a = {};
+bless $a, "Bob";
+ok $a->isa("Bob");
+
+package Human;
+sub eat {}
+
+package Female;
+@ISA=qw(Human);
+
+package Alice;
+@ISA=qw(Bob Female);
+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 $VERSION = 1.667;
+
+ sub write_perl { 1 }
+}
+
+package main;
+
+
+
+$a = new Alice;
+
+ok $a->isa("Alice");
+ok $a->isa("main::Alice"); # check that alternate class names work
+
+ok(("main::Alice"->new)->isa("Alice"));
+
+ok $a->isa("Bob");
+ok $a->isa("main::Bob");
+
+ok $a->isa("Female");
+
+ok ! $a->isa("Female\0NOT REALLY!"), "->isa is nul-clean.";
+
+ok $a->isa("Human");
+
+ok ! $a->isa("Male");
+
+ok ! $a->isa('Programmer');
+
+ok $a->isa("HASH");
+
+ok $a->can("eat");
+ok ! $a->can("eat\0Except not!"), "->can is nul-clean.";
+ok ! $a->can("sleep");
+ok my $ref = $a->can("drink"); # returns a coderef
+is $a->$ref("tea"), "drinking tea"; # ... which works
+ok $ref = $a->can("sing");
+eval { $a->$ref() };
+ok $@; # ... but not if no actual subroutine
+
+ok (!Cedric->isa('Programmer'));
+
+ok (Cedric->isa('Human'));
+
+push(@Cedric::ISA,'Programmer');
+
+ok (Cedric->isa('Programmer'));
+
+{
+ package Alice;
+ base::->import('Programmer');
+}
+
+ok $a->isa('Programmer');
+ok $a->isa("Female");
+
+@Cedric::ISA = qw(Bob);
+
+ok (!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; $q++) {
+ is UNIVERSAL::isa($vals[$p], $refs[$q]), ($p==$q or $p+$q==1);
+ };
+};
+
+ok UNIVERSAL::can(23, "can");
+++${"23::foo"};
+ok UNIVERSAL::can("23", "can"), '"23" can can when the pack exists';
+ok UNIVERSAL::can(23, "can"), '23 can can when the pack exists';
+sub IO::Handle::turn {}
+ok UNIVERSAL::can(*STDOUT, 'turn'), 'globs with IOs can';
+ok UNIVERSAL::can(\*STDOUT, 'turn'), 'globrefs with IOs can';
+ok UNIVERSAL::can("STDOUT", 'turn'), 'IO barewords can';
+
+ok $a->can("VERSION");
+
+ok $a->can("can");
+ok ! $a->can("export_tags"); # a method in Exporter
+
+cmp_ok eval { $a->VERSION }, '==', 2.718;
+
+ok ! (eval { $a->VERSION(2.719) });
+like $@, qr/^Alice version 2.719 required--this is only version 2.718 at /;
+
+ok (eval { $a->VERSION(2.718) });
+is $@, '';
+
+ok ! (eval { $a->VERSION("version") });
+like $@, qr/^Invalid version format/;
+
+$aversion::VERSION = "version";
+ok ! (eval { aversion->VERSION(2.719) });
+like $@, qr/^Invalid version format/;
+
+my $subs = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
+if ('a' lt 'A') {
+ is $subs, "can isa DOES VERSION";
+} else {
+ is $subs, "DOES VERSION can isa";
+}
+
+ok $a->isa("UNIVERSAL");
+
+ok ! UNIVERSAL::isa([], "UNIVERSAL");
+
+ok ! UNIVERSAL::can({}, "can");
+
+ok UNIVERSAL::isa(Alice => "UNIVERSAL");
+
+cmp_ok UNIVERSAL::can(Alice => "can"), '==', \&UNIVERSAL::can;
+
+# now use UNIVERSAL.pm and see what changes
+eval "use UNIVERSAL";
+
+ok $a->isa("UNIVERSAL");
+
+my $sub2 = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
+# XXX import being here is really a bug
+if ('a' lt 'A') {
+ is $sub2, "can import isa DOES VERSION";
+} else {
+ is $sub2, "DOES VERSION can import isa";
+}
+
+eval 'sub UNIVERSAL::sleep {}';
+ok $a->can("sleep");
+
+ok UNIVERSAL::can($b, "can");
+
+ok ! $a->can("export_tags"); # a method in Exporter
+
+ok ! UNIVERSAL::isa("\xff\xff\xff\0", 'HASH');
+
+{
+ # test isa() and can() on magic variables
+ "Human" =~ /(.*)/;
+ ok $1->isa("Human");
+ ok $1->can("eat");
+ package HumanTie;
+ sub TIESCALAR { bless {} }
+ sub FETCH { "Human" }
+ tie my($x), "HumanTie";
+ ::ok $x->isa("Human");
+ ::ok $x->can("eat");
+}
+
+# bugid 3284
+# a second call to isa('UNIVERSAL') when @ISA is null failed due to caching
+
+@X::ISA=();
+my $x = {}; bless $x, 'X';
+ok $x->isa('UNIVERSAL');
+ok $x->isa('UNIVERSAL');
+
+
+# Check that the "historical accident" of UNIVERSAL having an import()
+# method doesn't effect anyone else.
+eval { Some::Package->import("bar") };
+is $@, '';
+
+
+# This segfaulted in a blead.
+fresh_perl_is('package Foo; Foo->VERSION; print "ok"', 'ok');
+
+# So did this.
+fresh_perl_is('$:; UNIVERSAL::isa(":","Unicode::String");print "ok"','ok');
+
+package Foo;
+
+sub DOES { 1 }
+
+package Bar;
+
+@Bar::ISA = 'Foo';
+
+package Baz;
+
+package main;
+ok( Foo->DOES( 'bar' ), 'DOES() should call DOES() on class' );
+ok( Bar->DOES( 'Bar' ), '... and should fall back to isa()' );
+ok( Bar->DOES( 'Foo' ), '... even when inherited' );
+ok( Baz->DOES( 'Baz' ), '... even without inheriting any other DOES()' );
+ok( ! Baz->DOES( 'Foo' ), '... returning true or false appropriately' );
+
+ok( ! "T"->DOES( "T\0" ), 'DOES() is nul-clean' );
+ok( ! Baz->DOES( "Baz\0Boy howdy" ), 'DOES() is nul-clean' );
+
+package Pig;
+package Bodine;
+Bodine->isa('Pig');
+*isa = \&UNIVERSAL::isa;
+eval { isa({}, 'HASH') };
+::is($@, '', "*isa correctly found");
+
+package main;
+eval { UNIVERSAL::DOES([], "foo") };
+like( $@, qr/Can't call method "DOES" on unblessed reference/,
+ 'DOES call error message says DOES, not isa' );
+
+# Tests for can seem to be split between here and method.t
+# Add the verbatim perl code mentioned in the comments of
+# http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2001-05/msg01710.html
+# but never actually tested.
+is(UNIVERSAL->can("NoSuchPackage::foo"), undef);
+
+@splatt::ISA = 'zlopp';
+ok (splatt->isa('zlopp'));
+ok (!splatt->isa('plop'));
+
+# This should reset the ->isa lookup cache
+@splatt::ISA = 'plop';
+# And here is the new truth.
+ok (!splatt->isa('zlopp'));
+ok (splatt->isa('plop'));
+
+use warnings "deprecated";
+{
+ my $m;
+ local $SIG{__WARN__} = sub { $m = $_[0] };
+ eval "use UNIVERSAL 'can'";
+ like($@, qr/^UNIVERSAL does not export anything\b/,
+ "error for UNIVERSAL->import('can')");
+ is($m, undef,
+ "no deprecation warning for UNIVERSAL->import('can')");
+
+ undef $m;
+ eval "use UNIVERSAL";
+ is($@, "",
+ "no error for UNIVERSAL->import");
+ is($m, undef,
+ "no deprecation warning for UNIVERSAL->import");
+}
+
+# Test: [perl #66112]: change @ISA inside sub isa
+{
+ package RT66112::A;
+
+ package RT66112::B;
+
+ sub isa {
+ my $self = shift;
+ @ISA = qw/RT66112::A/;
+ return $self->SUPER::isa(@_);
+ }
+
+ package RT66112::C;
+
+ package RT66112::D;
+
+ sub isa {
+ my $self = shift;
+ @RT66112::E::ISA = qw/RT66112::A/;
+ return $self->SUPER::isa(@_);
+ }
+
+ package RT66112::E;
+
+ package main;
+
+ @RT66112::B::ISA = qw//;
+ @RT66112::C::ISA = qw/RT66112::B/;
+ @RT66112::T1::ISA = qw/RT66112::C/;
+ ok(RT66112::T1->isa('RT66112::C'), "modify \@ISA in isa (RT66112::T1 isa RT66112::C)");
+
+ @RT66112::B::ISA = qw//;
+ @RT66112::C::ISA = qw/RT66112::B/;
+ @RT66112::T2::ISA = qw/RT66112::C/;
+ ok(RT66112::T2->isa('RT66112::B'), "modify \@ISA in isa (RT66112::T2 isa RT66112::B)");
+
+ @RT66112::B::ISA = qw//;
+ @RT66112::C::ISA = qw/RT66112::B/;
+ @RT66112::T3::ISA = qw/RT66112::C/;
+ ok(RT66112::T3->isa('RT66112::A'), "modify \@ISA in isa (RT66112::T3 isa RT66112::A)") or require mro, diag "@{mro::get_linear_isa('RT66112::T3')}";
+
+ @RT66112::E::ISA = qw/RT66112::D/;
+ @RT66112::T4::ISA = qw/RT66112::E/;
+ ok(RT66112::T4->isa('RT66112::E'), "modify \@ISA in isa (RT66112::T4 isa RT66112::E)");
+
+ @RT66112::E::ISA = qw/RT66112::D/;
+ @RT66112::T5::ISA = qw/RT66112::E/;
+ ok(! RT66112::T5->isa('RT66112::D'), "modify \@ISA in isa (RT66112::T5 not isa RT66112::D)");
+
+ @RT66112::E::ISA = qw/RT66112::D/;
+ @RT66112::T6::ISA = qw/RT66112::E/;
+ ok(RT66112::T6->isa('RT66112::A'), "modify \@ISA in isa (RT66112::T6 isa RT66112::A)");
+}
+
+ok(Undeclared->can("can"));
+sub Undeclared::foo { }
+ok(Undeclared->can("foo"));
+ok(!Undeclared->can("something_else"));
+
+ok(Undeclared->isa("UNIVERSAL"));
+
+# keep this at the end to avoid messing up earlier tests, since it modifies
+# @UNIVERSAL::ISA
+@UNIVERSAL::ISA = ('UniversalParent');
+{ package UniversalIsaTest1; }
+ok(UniversalIsaTest1->isa('UniversalParent'));
+ok(UniversalIsaTest2->isa('UniversalParent'));
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