Elgg\Http\ResponseFactoryTest::testCanSendAjaxErrorResponse PHP Method

    public function testCanSendAjaxErrorResponse()
    {
        $service = $this->createService();
        ob_start();
        $error = 'error';
        $wrapped_content = json_encode(['error' => $error]);
        $response = $service->send($this->ajax->respondWithError($error));
        $this->assertInstanceOf(JsonResponse::class, $response);
        $this->assertEquals($wrapped_content, $response->getContent());
        $output = ob_get_clean();
        $this->assertEquals($wrapped_content, $output);
    }