public function testContains()
{
$a = array(0 => array('name' => 'main'), 1 => array('name' => 'about'));
$b = array(0 => array('name' => 'main'), 1 => array('name' => 'about'), 2 => array('name' => 'contact'), 'a' => 'b');
$this->assertTrue(Set::contains($a, $a));
$this->assertFalse(Set::contains($a, $b));
$this->assertTrue(Set::contains($b, $a));
}