public function testInstantiation() { $response = new NotModified('http://conent-location', 'ofk48fh1ubuc', ['Content-Type' => 'application/json']); $this->assertEquals(304, $response->getStatusCode()); $this->assertEquals('http://conent-location', $response->headers->get('content-location')); $this->assertEquals('ofk48fh1ubuc', $response->headers->get('etag')); }