/**
  * @param Collection $collection
  * @depends testAdd
  */
 public function testAddIsStrict(Collection $collection)
 {
     $expected = $collection->toArray();
     array_push($expected, 10, (string) 10);
     $collection->add(10, true)->add(10, true)->add((string) 10, true);
     $this->assertSame($expected, $collection->toArray());
 }