public function testContains()
{
$this->assertTrue($this->v1->containsAll($this->v2));
$this->assertTrue($this->v2->containsAll($this->v1));
$v = new Vector();
$v->addAll($this->cases);
$n = new Vector();
$n->addAll($this->cases);
$v->removeElementAt(rand(0, $v->size()));
// confirm the subset/superset relationship
$this->assertTrue($this->v1->containsAll($v));
$this->assertFalse(!$v->containsAll($this->v1));
}
