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universal.t
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1998-07-19
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97 lines
#!./perl
#
# check UNIVERSAL
#
BEGIN {
chdir 't' if -d 't';
@INC = '../lib' if -d '../lib';
}
print "1..72\n";
$a = {};
bless $a, "Bob";
print "not " unless $a->isa("Bob");
print "ok 1\n";
package Human;
sub eat {}
package Female;
@ISA=qw(Human);
package Alice;
@ISA=qw(Bob Female);
sub drink {}
sub new { bless {} }
$Alice::VERSION = 2.718;
package main;
my $i = 2;
sub test { print "not " unless shift; print "ok $i\n"; $i++; }
$a = new Alice;
test $a->isa("Alice");
test $a->isa("Bob");
test $a->isa("Female");
test $a->isa("Human");
test ! $a->isa("Male");
test $a->can("drink");
test $a->can("eat");
test ! $a->can("sleep");
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 2.719 required--this is only version 2.718 at /;
test (eval { $a->VERSION(2.718) }) && ! $@;
my $subs = join ' ', sort grep { defined &{"UNIVERSAL::$_"} } keys %UNIVERSAL::;
test $subs eq "VERSION can isa";
test $a->isa("UNIVERSAL");
# 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
test $sub2 eq "VERSION can import isa";
eval 'sub UNIVERSAL::sleep {}';
test $a->can("sleep");
test ! UNIVERSAL::can($b, "can");
test ! $a->can("export_tags"); # a method in Exporter