Test::MockObject::Extends question

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

Hi,

I've got a class that calls methods like $self->method, which I'd like to write tests for. Because the internal method call might have state data I don't want to setup, I'd like to mock this method. For this, I thought I could use Test::MockObject::Extends.

Unfortunately, it looks like T::MO::E doesn't mock these methods. As an example, look at this class:

use strict;
use warnings;

package Foo;

sub new {
    my $class = shift;
    
    return bless {}, $class;
}

sub bar {
    my $self = shift;
    
    $self->baz;
    
    return 1;
}

sub baz {
    die;
}

1;
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(This has to be in a separate file if you want to test this, because T::MO::E tries to 'use' the module when you call new()).

The test script below should be ok, but instead it dies (when bar() internally calls baz(), which I've attempted to mock):

use strict;
use warnings;

use Foo;

use Test::MockObject::Extends;

my $foo = Foo->new();
my $mock_foo = Test::MockObject::Extends->new( $foo );

$mock_foo->mock('baz',sub { 1 });

$mock_foo->bar;
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Am I totally missing the point of Test::MockObject::Extends? Is my code untestable and in need of refactoring (probably, but not necessarily practical)? Any other suggestions?

Thanks.

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Replies are listed 'Best First'.
Re: Test::MockObject::Extends question by chromatic (Archbishop) on Jul 15, 2005 at 17:15 UTC
Are you using version 1.00? I can't reproduce the error with that version and think I fixed the bug in the latest release.	[reply]
Re^2: Test::MockObject::Extends question by Mutant (Priest) on Jul 18, 2005 at 08:21 UTC
My apologies. I was indeed running an old version. Thanks.	[reply]