Google\Cloud\Tests\Datastore\Query\QueryTest::testOperatorConstantsEquals PHP Method

    public function testOperatorConstantsEquals()
    {
        $this->query->filter('propName', Query::OP_EQUALS, 'val');
        $res = $this->query->queryObject();
        $filters = $res['filter']['compositeFilter']['filters'];
        $this->assertEquals('EQUAL', $filters[0]['propertyFilter']['op']);
    }