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=pod
=encoding utf-8
=head1 PURPOSE
Basic tests for B<Overload> from L<Types::Standard>.
=head1 AUTHOR
Toby Inkster E<lt>tobyink@cpan.orgE<gt>.
=head1 COPYRIGHT AND LICENCE
This software is copyright (c) 2019-2023 by Toby Inkster.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
use strict;
use warnings;
use Test::More;
use Test::Fatal;
use Test::TypeTiny;
use Types::Standard qw( Overload );
isa_ok(Overload, 'Type::Tiny', 'Overload');
is(Overload->name, 'Overload', 'Overload has correct name');
is(Overload->display_name, 'Overload', 'Overload has correct display_name');
is(Overload->library, 'Types::Standard', 'Overload knows it is in the Types::Standard library');
ok(Types::Standard->has_type('Overload'), 'Types::Standard knows it has type Overload');
ok(!Overload->deprecated, 'Overload is not deprecated');
ok(!Overload->is_anon, 'Overload is not anonymous');
ok(Overload->can_be_inlined, 'Overload can be inlined');
is(exception { Overload->inline_check(q/$xyz/) }, undef, "Inlining Overload doesn't throw an exception");
ok(!Overload->has_coercion, "Overload doesn't have a coercion");
ok(Overload->is_parameterizable, "Overload is parameterizable");
is(Overload->type_default, undef, "Overload has no type_default");
#
# The @tests array is a list of triples:
#
# 1. Expected result - pass, fail, or xxxx (undefined).
# 2. A description of the value being tested.
# 3. The value being tested.
#
my @tests = (
fail => 'undef' => undef,
fail => 'false' => !!0,
fail => 'true' => !!1,
fail => 'zero' => 0,
fail => 'one' => 1,
fail => 'negative one' => -1,
fail => 'non integer' => 3.1416,
fail => 'empty string' => '',
fail => 'whitespace' => ' ',
fail => 'line break' => "\n",
fail => 'random string' => 'abc123',
fail => 'loaded package name' => 'Type::Tiny',
fail => 'unloaded package name' => 'This::Has::Probably::Not::Been::Loaded',
fail => 'a reference to undef' => do { my $x = undef; \$x },
fail => 'a reference to false' => do { my $x = !!0; \$x },
fail => 'a reference to true' => do { my $x = !!1; \$x },
fail => 'a reference to zero' => do { my $x = 0; \$x },
fail => 'a reference to one' => do { my $x = 1; \$x },
fail => 'a reference to empty string' => do { my $x = ''; \$x },
fail => 'a reference to random string' => do { my $x = 'abc123'; \$x },
fail => 'blessed scalarref' => bless(do { my $x = undef; \$x }, 'SomePkg'),
fail => 'empty arrayref' => [],
fail => 'arrayref with one zero' => [0],
fail => 'arrayref of integers' => [1..10],
fail => 'arrayref of numbers' => [1..10, 3.1416],
fail => 'blessed arrayref' => bless([], 'SomePkg'),
fail => 'empty hashref' => {},
fail => 'hashref' => { foo => 1 },
fail => 'blessed hashref' => bless({}, 'SomePkg'),
fail => 'coderef' => sub { 1 },
fail => 'blessed coderef' => bless(sub { 1 }, 'SomePkg'),
fail => 'glob' => do { no warnings 'once'; *SOMETHING },
fail => 'globref' => do { no warnings 'once'; my $x = *SOMETHING; \$x },
fail => 'blessed globref' => bless(do { no warnings 'once'; my $x = *SOMETHING; \$x }, 'SomePkg'),
fail => 'regexp' => qr/./,
fail => 'blessed regexp' => bless(qr/./, 'SomePkg'),
fail => 'filehandle' => do { open my $x, '<', $0 or die; $x },
fail => 'filehandle object' => do { require IO::File; 'IO::File'->new($0, 'r') },
fail => 'ref to scalarref' => do { my $x = undef; my $y = \$x; \$y },
fail => 'ref to arrayref' => do { my $x = []; \$x },
fail => 'ref to hashref' => do { my $x = {}; \$x },
fail => 'ref to coderef' => do { my $x = sub { 1 }; \$x },
fail => 'ref to blessed hashref' => do { my $x = bless({}, 'SomePkg'); \$x },
pass => 'object stringifying to ""' => do { package Local::OL::StringEmpty; use overload q[""] => sub { "" }; bless [] },
pass => 'object stringifying to "1"' => do { package Local::OL::StringOne; use overload q[""] => sub { "1" }; bless [] },
pass => 'object numifying to 0' => do { package Local::OL::NumZero; use overload q[0+] => sub { 0 }; bless [] },
pass => 'object numifying to 1' => do { package Local::OL::NumOne; use overload q[0+] => sub { 1 }; bless [] },
pass => 'object overloading arrayref' => do { package Local::OL::Array; use overload q[@{}] => sub { $_[0]{array} }; bless {array=>[]} },
pass => 'object overloading hashref' => do { package Local::OL::Hash; use overload q[%{}] => sub { $_[0][0] }; bless [{}] },
pass => 'object overloading coderef' => do { package Local::OL::Code; use overload q[&{}] => sub { $_[0][0] }; bless [sub { 1 }] },
#TESTS
);
while (@tests) {
my ($expect, $label, $value) = splice(@tests, 0 , 3);
if ($expect eq 'xxxx') {
note("UNDEFINED OUTCOME: $label");
}
elsif ($expect eq 'pass') {
should_pass($value, Overload, ucfirst("$label should pass Overload"));
}
elsif ($expect eq 'fail') {
should_fail($value, Overload, ucfirst("$label should fail Overload"));
}
else {
fail("expected '$expect'?!");
}
}
#
# Type::Tiny itself overloads q[&{}] and q[""] but not q[${}].
#
should_pass(Overload, Overload[ q[&{}] ]);
should_pass(Overload, Overload[ q[""] ]);
should_fail(Overload, Overload[ q[${}] ]);
#
# It's possible to check multiple overloaded operations.
#
should_pass(Overload, Overload[ q[&{}], q[""] ]);
should_fail(Overload, Overload[ q[""], q[${}] ]);
should_fail(Overload, Overload[ q[&{}], q[${}] ]);
#
# In the following example, $fortytwo_withfallback doesn't overload
# '+' but still passes Overload['+'] because it provides a numification
# overload and allows fallbacks.
#
my $fortytwo_nofallback = do {
package Local::OL::NoFallback;
use overload q[0+] => sub { ${$_[0]} };
my $x = 42;
bless \$x;
};
my $fortytwo_withfallback = do {
package Local::OL::WithFallback;
use overload q[0+] => sub { ${$_[0]} }, fallback => 1;
my $x = 42;
bless \$x;
};
should_pass($fortytwo_nofallback, Overload['0+']);
should_pass($fortytwo_withfallback, Overload['0+']);
should_fail($fortytwo_nofallback, Overload['+']);
should_fail($fortytwo_withfallback, Overload['+']);
done_testing;
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