public function testThatCollectionCanBeFilteredByPropertiesThatDontMatch()
 {
     //Mostly covered by the filterWhere tests
     $items = [["a" => 1], ["a" => 2]];
     $filtered = CollectionUtility::filterWhereNot($items, ["a" => 1]);
     $this->assertEquals([["a" => 2]], $filtered);
 }