Symfony\Component\HttpFoundation\Tests\ResponseTest::testSetVary PHP Method

    public function testSetVary()
    {
        $response = new Response();
        $response->setVary('Accept-Language');
        $this->assertEquals(array('Accept-Language'), $response->getVary());

        $response->setVary('Accept-Language, User-Agent');
        $this->assertEquals(array('Accept-Language', 'User-Agent'), $response->getVary(), '->setVary() replace the vary header by default');

        $response->setVary('X-Foo', false);
        $this->assertEquals(array('Accept-Language', 'User-Agent', 'X-Foo'), $response->getVary(), '->setVary() doesn\'t wipe out earlier Vary headers if replace is set to false');
    }