Testing Symfony DELETE routes

I'm setting up phpunit for testing, and started with the Controller routes. The GET routes are working fine, however, the DELETE routes are not. NOTE: I'm not testing adding/removing database entities yet, just validating routes.

* @Route("/{deviceprofile_id}/delete",
*     name="delete",
*     methods={"DELETE"})

The test class:

class DeviceProfileControllerTest extends WebTestCase
{
    public function testRouteDelete()
    {
        $client = static::createClient();
        $client->followRedirects(true);
        $client->request('DELETE', '/1/delete');
        $this->assertResponseIsSuccessful();
    }
}

The phpunit error:

Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException: No route found for "GET /1/delete": Method Not Allowed (Allow: DELETE)

Based on the error, it appears that my $client->request is only doing 'GETs' regardless of the method listed.

So, what function should I be calling to test a 'DELETE' method?