NAME

Type::Tiny::Manual::UsingWithTestMore - Type::Tiny for test suites

MANUAL

Test::TypeTiny

This is a module for testing that types you've defined accept and reject the values you think they should.

 should_pass($value, $type);
 should_fail($othervalue, $type);

Easy. (But yeah, I always forget whether the type goes first or second!)

There's also a function to test that subtype/supertype relationships are working okay.

 ok_subtype($type, @subtypes);

Of course you can just check a type like this:

 ok( $type->check($value) );

But the advantage of should_pass is that if the EXTENDED_TESTING environment variable is set to true, should_pass will also perform a strict check on the value, which involves climbing up the type's inheritance tree (its parent, its parent's parent, etc) to make sure the value passes all their constraints.

If a normal check and strict check differ, this is usually a problem in the inlining code somewhere.

See Test::TypeTiny for more information.

Type::Tiny as a Replacement for Test::Deep

Here's one of the examples from the Test::Deep documentation:

 my $name_re = re('^(Mr|Mrs|Miss) \w+ \w+$');
 cmp_deeply(
   $person,
   {
     Name       => $name_re,
     Phone      => re('^0d{6}$'),
     ChildNames => array_each($name_re)
   },
   "person ok"
 );

It's pretty easy to rewrite this to use Types::Standard:

 my $name = StrMatch[ qr/^(Mr|Mrs|Miss) \w+ \w+$/ ];
 should_pass(
   $person,
   Dict[
     Name         => $name,
     Phone        => StrMatch[ qr/^0d{6}$/ ],
     ChildNames   => ArrayRef[$name]
   ]
 );

There's nothing especially wrong with Test::Deep, but if you're already familiar with Type::Tiny's built-in types and you've maybe written your own type libraries too, it will save you having to switch between using two separate systems of checks.

NEXT STEPS

Here's your next step:

  • Type::Tiny::Manual::Params

    Advanced information on Type::Params, and using Type::Tiny with other signature modules like Function::Parameters and Kavorka.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

This software is copyright (c) 2013-2014, 2017-2019 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.

DISCLAIMER OF WARRANTIES

THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.