public function countReturnsCorrectNumber($sourceObjects, $filterString, $expectedResultArray)
{
$query = $this->createFlowQuery($sourceObjects);
$this->assertSame(count($expectedResultArray), $query->filter($filterString)->count());
$this->assertSame(count($sourceObjects), $query->count());
$this->assertSame(count($sourceObjects), count($query));
}