Problem when Test::Deep and Test::Class are used together

mp has asked for the wisdom of the Perl Monks concerning the following question:

When I use Test::Deep within a Test::Class subclass and run the test, I get an error: Test::Deep not Test::Class or integer at 01-TestDeep.t line 6

If the use Test::Deep is commented out, it works fine.

Does anyone know of a workaround for this (other than not using Test::Deep with Test::Class)?

I'm using the latest versions of both modules:
Test::Deep version = 0.093
Test::Class version = 0.11

Project/Test/TestDeep.pm

package Project::Test::TestDeep;
use strict;
use warnings;

use base qw(Test::Class);
use Test::More;
# If the following line is uncommented, the test fails.
#use Test::Deep;

sub setup : Tests(setup => 2) {
  ok(2);
}

sub test : Tests(2) {
  ok(1);
  ok(1);
}

1;
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test_deep.t:

use strict;
use warnings;

use PSC::Test::TestDeep;

Test::Class->runtests();

exit;
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Re: Problem when Test::Deep and Test::Class are used together by adrianh (Chancellor) on Apr 01, 2006 at 16:26 UTC
This is happening because Test::Deep defines it's own `isa()` subroutine, which has different functionality from the UNIVERSAL::isa. This means that when runtests() is doing it's automagical "find all test classes" using `Test::Deep->isa('Test::Class')` it always get a true value - so incorrectly treats it as a Test::Class. Expect a patched Test::Class soon :-)	[reply] [d/l] [select]
Re^2: Problem when Test::Deep and Test::Class are used together by fergal (Chaplain) on Apr 23, 2006 at 22:07 UTC
Hmm, that's interesting. It's not really a bug to have an isa subroutine in a non-OO module but it can lead to confusion. If it wasn't part of the interface I'd rip it out.	[reply]
Re^3: Problem when Test::Deep and Test::Class are used together by adrianh (Chancellor) on Apr 24, 2006 at 13:25 UTC
Hmm, that's interesting. It's not really a bug to have an isa subroutine in a non-OO module but it can lead to confusion. Yup. Yet another quirk of Perl 5's OO system :-/	[reply]
Re: Problem when Test::Deep and Test::Class are used together by adrianh (Chancellor) on Oct 04, 2006 at 16:18 UTC
This has been fixed in the 0.15 release that should be hitting CPAN any second now. (get there in the end :-)	[reply]