$title = Title::makeTitle( NS_CATEGORY, 'SomeCategory' );
$page = WikiPage::factory( $title );
$this->assertEquals( 'WikiCategoryPage', get_class( $page ) );
$title = Title::makeTitle( NS_CATEGORY, 'SomeCategory' );
$page = WikiPage::factory( $title );
$this->assertEquals( 'WikiCategoryPage', get_class( $page ) );