Return additional themes provided by modules.
Only use this hook for testing purposes. Use a hidden MYMODULE_test.module to implement this hook. Testing themes should be hidden, too.
This hook is invoked from _system_rebuild_theme_data() and allows modules to register additional themes outside of the regular 'themes' directories of a Drupal installation.
An associative array. Each key is the system name of a theme and each value is the corresponding path to the theme's .info file.
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
function hook_system_theme_info() {
$themes['mymodule_test_theme'] = drupal_get_path('module', 'mymodule') . '/mymodule_test_theme/mymodule_test_theme.info';
return $themes;
}