public function testFilter()
{
$self = $this->query->filter('propname', '=', 'value');
$this->assertInstanceOf(Query::class, $self);
$res = $this->query->queryObject();
$filters = $res['filter']['compositeFilter']['filters'];
$this->assertEquals($filters[0]['propertyFilter'], ['property' => ['name' => 'propname'], 'value' => ['stringValue' => 'value'], 'op' => Query::OP_DEFAULT]);
}