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.