NAME¶

Test::MockModule - Override subroutines in a module for unit testing

SYNOPSIS¶

   use Module::Name;
   use Test::MockModule;
   {
       my $module = new Test::MockModule('Module::Name');
       $module->mock('subroutine', sub { ... });
       Module::Name::subroutine(@args); # mocked
   }
   Module::Name::subroutine(@args); # original subroutine

DESCRIPTION¶

"Test::MockModule" lets you temporarily redefine subroutines in other packages for the purposes of unit testing. A "Test::MockModule" object is set up to mock subroutines for a given module. The object remembers the original subroutine so it can be easily restored. This happens automatically when all MockModule objects for the given module go out of scope, or when you "unmock()" the subroutine.

METHODS¶

new($package[, %options])

Returns an object that will mock subroutines in the specified $package.

 

If there is no $VERSION defined in $package, the module will be automatically loaded. You can override this behaviour by setting the "no_auto" option:

 

    my $mock = new Test::MockModule('Module::Name', no_auto => 1);
    

get_package()

Returns the target package name for the mocked subroutines

is_mocked($subroutine)

Returns a boolean value indicating whether or not the subroutine is currently mocked

mock($subroutine => \&coderef)

Temporarily replaces one or more subroutines in the mocked module. A subroutine can be mocked with a code reference or a scalar. A scalar will be recast as a subroutine that returns the scalar.

 

The following statements are equivalent:

 

    $module->mock(purge => 'purged');
    $module->mock(purge => sub { return 'purged'});
    $module->mock(updated => [localtime()]);
    $module->mock(updated => sub { return [localtime()]});
    

 

However, "undef" is a special case. If you mock a subroutine with "undef" it will install an empty subroutine

 

    $module->mock(purge => undef);
    $module->mock(purge => sub { });
    

 

rather than a subroutine that returns "undef":

 

    $module->mock(purge => sub { undef });
    

 

You can call "mock()" for the same subroutine many times, but when you call "unmock()", the original subroutine is restored (not the last mocked instance).

original($subroutine)

Returns the original (unmocked) subroutine

unmock($subroutine [, ...])

Restores the original $subroutine. You can specify a list of subroutines to "unmock()" in one go.

unmock_all()

Restores all the subroutines in the package that were mocked. This is automatically called when all "Test::MockObject" objects for the given package go out of scope.

SEE ALSO¶

Test::MockObject::Extends Sub::Override

AUTHOR¶

Simon Flack <simonflk _AT_ cpan.org>

COPYRIGHT¶

Copyright 2004 Simon Flack <simonflk _AT_ cpan.org>. All rights reserved You may distribute under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl README file.