Type::Tiny::Manual::UsingWithTestMore(3) User Contributed Perl Documentation Type::Tiny::Manual::UsingWithTestMore(3)

# [NAME](#NAME)

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

# [MANUAL](#MANUAL)

## [Test::TypeTiny](#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](#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](#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](#AUTHOR)

Toby Inkster <tobyink@cpan.org>.

# [COPYRIGHT AND LICENCE](#COPYRIGHT_AND_LICENCE)

This software is copyright (c) 2013-2014, 2017-2025 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](#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.

2026-06-28 perl v5.42.2

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Document: Type::Tiny::Manual::UsingWithTestMore(3pm) from perl-type-tiny 2.010001-r3 (Chainguard OS)
Source: https://github.com/tobyink/p5-type-tiny