public function testAddMockExtension()
{
$extension = $this->createMock('Apishka_Templater_ExtensionInterface');
$extension->expects($this->once())->method('getName')->will($this->returnValue('mock'));
$loader = new Apishka_Templater_Loader_Array(array('page' => 'hey'));
$twig = new Apishka_Templater_Environment($loader);
$twig->addExtension($extension);
$this->assertInstanceOf('Apishka_Templater_ExtensionInterface', $twig->getExtension('mock'));
$this->assertTrue($twig->isTemplateFresh('page', time()));
}