Contributed by
Fabien Potencier
in #8820.

Instead of relying on HTTP status code as integer in your code, which might look like magic values to some, it might be more readable to use the new constants provided by the Symfony Response class in 2.4:

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use Symfony\Component\HttpFoundation\Response;

$this->assertEquals(Response::HTTP_OK, $response->getStatusCode());

See the Response class for a full list of supported constants.