Hal\Component\BusinessRule\Collection::where PHP Method

    public function where($clause)
    {
        array_push($this->clauses, $clause);
        return $this;
    }

 public function testCollectionAcceptsArgumentAfterFiltering()
 {
     $collection = new Collection(array(new CollectionTestUser('jean-françois', 27, 500), new CollectionTestUser('bénédicte', 28, 500), new CollectionTestUser('bob', 5, 0), new CollectionTestUser('alice', 40, 0)));
     $request = $collection->where('user => user.age > 18 and user.age < 40');
     $collection->push(new CollectionTestUser('isAddedAfter', 30, 500));
     $this->assertEquals(3, sizeof($request));
 }