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Karen Etheridge 🐾 🌋


Test::Deep::Type - A Test::Deep plugin for validating type constraints


version 0.006


    use Test::More;
    use Test::Deep;
    use Test::Deep::Type;
    use MooseX::Types::Moose 'Str';

            message => 'ack I am slain',
            counter => 123,
            message => is_type(Str),
            counter => is_type(sub { die "not an integer" unless int($_[0]) eq $_[0] }),
        'message is a plain string, counter is a number',


Test::Deep::Type provides the sub is_type to indicate that the data being tested must validate against the passed type. This is an actual type object, not a string name -- for example something provided via MooseX::Types, or a plain old coderef that returns a bool (such as what might be used in a Moo type constraint).


  • is_type

    Exported by default; to be used within a Test::Deep comparison function such as cmp_deeply. As this module aims to be a solution for many popular type systems, we attempt to use the type in multiple ways:

    MooseX::Types/Moose::Meta::TypeConstraint-style types:

    If the validate method exists, it is invoked on the type object with the data as its parameter (which should return undef on success, and the error message on failure).

    coderef/Moo-style types:

    If the type appears to be or act like a coderef (either a coderef, blessed or unblessed, or possesses a coderef overload) the type is invoked as a sub, with the data as its parameter. Its return value is treated as a boolean; if it also dies with a message describing the failure, this message is used in the failure diagnostics.

    Type::Tiny types fall into this category, and are fully supported.


Regular strings describing a type under a particular system (e.g. Moose, Params::Validate) are not currently supported.


Bugs may be submitted through https://rt.cpan.org/Public/Dist/Display.html?Name=Test-Deep-Type. I am also usually active on irc, as 'ether' at irc://irc.perl.org.



Karen Etheridge <ether@cpan.org>


This software is copyright (c) 2013 by Karen Etheridge.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.