public function testContainsAll()
{
// Remove the following lines when you implement this test.
$col = new HashSet();
$col->add(1);
$col->add(5);
$col->add(6);
$col->add(2);
$this->assertTrue($this->object->containsAll($col));
$col->add(788);
$this->assertFalse($this->object->containsAll($col));
}