Test::Stream::Compare::Custom - Custom field check for comparisons.


This distribution is deprecated in favor of Test2, Test2::Suite, and Test2::Workflow.

See Test::Stream::Manual::ToTest2 for a conversion guide.


Sometimes you want to do something complicated or unusual when validating a field nested inside a deep data structure. You could pull it out of the structure and test it separately, or you can use this to embed the check. This provides a way for you to write custom checks for fields in deep comparisons.


    my $cus = Test::Stream::Compare::Custom->new(
        name => 'IsRef',
        operator => 'ref(...)',
        code => sub {
            my ($got, $exists, $operator, $name) = @_;
            return ref($got) ? 1 : 0;

    # Pass
        { a => 1, ref => {},   b => 2 },
        { a => 1, ref => $cus, b => 2 },
        "This will pass"

    # Fail
        {a => 1, ref => 'notref', b => 2},
        {a => 1, ref => $cus,     b => 2},
        "This will fail"


Your custom sub will get 4 arguments:

    code => sub {
        my ($got, $exists, $operator, $name) = @_;
        return ref($got) ? 1 : 0;

$_ is also localized to $got to make it easier for those who need to use regexes.


This is the value to be checked.


This will be a boolean. This will be true if $got exists at all. If $exists is false then it means $got is not simply undef, but doesn't exist at all (think checking the value of a hash key that does not exist).


This is the operator specified at construction.


This is the name provided at construction.


$code = $cus->code

Get the coderef provided at construction.

$name = $cus->name

Get the name provided at construction.

$op = $cus->operator

Get the operator provided at construction

$bool = $cus->verify(got => $got, exists => $bool)


The source code repository for Test::Stream can be found at


Chad Granum <>


Chad Granum <>


Copyright 2015 Chad Granum <>.

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