public function testRemoveAll()
{
// Remove the following lines when you implement this test.
$col = new HashSet();
$col->add(89);
$col->add(78978);
$col->add(789);
$col->add(456);
$this->assertFalse($this->object->removeAll($col));
$col->add(4);
$this->assertTrue($this->object->removeAll($col));
}
