public function testExceptionBadGrantType()
{
$parameters = ['grant_type' => 'foo'];
$server = [];
$client = $this->createClient();
$crawler = $client->request('POST', '/api/oauth2/token', $parameters, [], $server);
$this->assertNotNull(json_decode($client->getResponse()->getContent()));
$tokenResponse = json_decode($client->getResponse()->getContent(), true);
$this->assertSame('invalid_request', $tokenResponse['error']);
}