class PingCest
{
    public function testPing(AcceptanceTester $I)
    {
        $query = 'query{ping {response}}';
        $I->sendGraphQL($query);
        $expected = [
            'ping' => [
                'response' => 'pong',
            ],
        ];
        $I->assertEquals($expected, $I->grabResponseData());
    }
}