Test::Object - Thoroughly testing objects via registered handlers

NAME

Test::Object - Thoroughly testing objects via registered handlers

SYNOPSIS

  ###################################################################
  # In your test module, register test handlers again class names   #
  ###################################################################
  
  package My::ModuleTester;
  
  use Test::More;
  use Test::Object;
  
  # Foo::Bar is a subclass of Foo
  Test::Object->register(
        class => 'Foo',
        tests => 5,
        code  => \&foo_ok,
        );
  Test::Object->register(
        class => 'Foo::Bar',
        # No fixed number of tests
        code  => \&foobar_ok,
        );
  
  sub foo_ok {
        my $object = shift;
        ok( $object->foo, '->foo returns true' );
  }
  
  sub foobar_ok {
        my $object = shift;
        is( $object->foo, 'bar', '->foo returns "bar"' );
  }
  
  1;
  
  
  
  ###################################################################
  # In test script, test object against all registered classes      #
  ###################################################################
  
  #!/usr/bin/perl -w
  
  use Test::More 'no_plan';
  use Test::Object;
  use My::ModuleTester;
  
  my $object = Foo::Bar->new;
  isa_ok( $object, 'Foo::Bar' );
  object_ok( $object );

DESCRIPTION

In situations where you have deep trees of classes, there is a common situation in which you test a module 4 or 5 subclasses down, which should follow the correct behaviour of not just the subclass, but of all the parent classes.

This should be done to ensure that the implementation of a subclass has not somehow ``broken'' the object's behaviour in a more general sense.

Test::Object is a testing package designed to allow you to easily test what you believe is a valid object against the expected behaviour of all of the classes in its inheritance tree in one single call.

To do this, you ``register'' tests (in the form of CODE or function references) with Test::Object, with each test associated with a particular class.

When you call object_ok in your test script, Test::Object will check the object against all registered tests. For each class that your object responds to $object->isa($class) for, the appropriate testing function will be called.

Doing it this way allows adapter objects and other things that respond to isa differently that the default to still be tested against the classes that it is advertising itself as correctly.

This also means that more than one test might be ``counted'' for each call to object_ok. You should account for this correctly in your expected test count.

SUPPORT

Bugs should be submitted via the CPAN bug tracker, located at

http://rt.cpan.org/NoAuth/ReportBug.html

For other issues, contact the author.

AUTHOR

Adam Kennedy <cpan@ali.as>

COPYRIGHT

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

The full text of the license can be found in the LICENSE file included with this module.