public function testExtract() {
		$a = array(
			array(
				'Article' => array(
					'id' => '1', 'user_id' => '1', 'title' => 'First Article',
					'body' => 'First Article Body', 'published' => 'Y',
					'created' => '2007-03-18 10:39:23', 'updated' => '2007-03-18 10:41:31'
				),
				'User' => array(
					'id' => '1', 'user' => 'mariano',
					'password' => '5f4dcc3b5aa765d61d8327deb882cf99',
					'created' => '2007-03-17 01:16:23',
					'updated' => '2007-03-17 01:18:31'
				),
				'Comment' => array(
					array(
						'id' => '1', 'article_id' => '1', 'user_id' => '2',
						'comment' => 'First Comment for First Article',
						'published' => 'Y', 'created' => '2007-03-18 10:45:23',
						'updated' => '2007-03-18 10:47:31'
					),
					array(
						'id' => '2', 'article_id' => '1', 'user_id' => '4',
						'comment' => 'Second Comment for First Article', 'published' => 'Y',
						'created' => '2007-03-18 10:47:23',
						'updated' => '2007-03-18 10:49:31'
					)
				),
				'Tag' => array(
					array(
						'id' => '1', 'tag' => 'tag1', 'created' => '2007-03-18 12:22:23',
						'updated' => '2007-03-18 12:24:31'
					),
					array(
						'id' => '2', 'tag' => 'tag2', 'created' => '2007-03-18 12:24:23',
						'updated' => '2007-03-18 12:26:31'
					)
				),
				'Deep' => array(
					'Nesting' => array(
						'test' => array(1 => 'foo', 2 => array('and' => array('more' => 'stuff')))
					)
				)
			),
			array(
				'Article' => array(
					'id' => '3', 'user_id' => '1', 'title' => 'Third Article',
					'body' => 'Third Article Body', 'published' => 'Y',
					'created' => '2007-03-18 10:43:23', 'updated' => '2007-03-18 10:45:31'
				),
				'User' => array(
					'id' => '2', 'user' => 'mariano',
					'password' => '5f4dcc3b5aa765d61d8327deb882cf99',
					'created' => '2007-03-17 01:16:23', 'updated' => '2007-03-17 01:18:31'
				),
				'Comment' => array(),
				'Tag' => array()
			),
			array(
				'Article' => array(
					'id' => '3', 'user_id' => '1', 'title' => 'Third Article',
					'body' => 'Third Article Body', 'published' => 'Y',
					'created' => '2007-03-18 10:43:23', 'updated' => '2007-03-18 10:45:31'
				),
				'User' => array(
					'id' => '3', 'user' => 'mariano',
					'password' => '5f4dcc3b5aa765d61d8327deb882cf99',
					'created' => '2007-03-17 01:16:23', 'updated' => '2007-03-17 01:18:31'
				),
				'Comment' => array(),
				'Tag' => array()
			),
			array(
				'Article' => array(
					'id' => '3', 'user_id' => '1', 'title' => 'Third Article',
					'body' => 'Third Article Body', 'published' => 'Y',
					'created' => '2007-03-18 10:43:23', 'updated' => '2007-03-18 10:45:31'
				),
				'User' => array(
					'id' => '4', 'user' => 'mariano',
					'password' => '5f4dcc3b5aa765d61d8327deb882cf99',
					'created' => '2007-03-17 01:16:23', 'updated' => '2007-03-17 01:18:31'
				),
				'Comment' => array(),
				'Tag' => array()
			),
			array(
				'Article' => array(
					'id' => '3', 'user_id' => '1', 'title' => 'Third Article',
					'body' => 'Third Article Body', 'published' => 'Y',
					'created' => '2007-03-18 10:43:23', 'updated' => '2007-03-18 10:45:31'
				),
				'User' => array(
					'id' => '5', 'user' => 'mariano',
					'password' => '5f4dcc3b5aa765d61d8327deb882cf99',
					'created' => '2007-03-17 01:16:23', 'updated' => '2007-03-17 01:18:31'
				),
				'Comment' => array(),
				'Tag' => array()
			)
		);

		$b = array('Deep' => $a[0]['Deep']);

		$c = array(
			array('a' => array('I' => array('a' => 1))),
			array('a' => array(2)),
			array('a' => array('II' => array('a' => 3, 'III' => array('a' => array('foo' => 4)))))
		);

		$expected = array(array('a' => $c[2]['a']));
		$result = Set::extract($c, '/a/II[a=3]/..');
		$this->assertEqual($expected, $result);

		$expected = array(1, 2, 3, 4, 5);
		$result = Set::extract($a, '/User/id');
		$this->assertEqual($expected, $result);

		$expected = array(1, 2, 3, 4, 5);
		$result = Set::extract($a, '/User/id');
		$this->assertEqual($expected, $result);

		$expected = array(
			array('id' => 1), array('id' => 2), array('id' => 3), array('id' => 4), array('id' => 5)
		);
		$result = Set::extract($a, '/User/id', array('flatten' => false));
		$this->assertEqual($expected, $result);

		$expected = array(array('test' => $a[0]['Deep']['Nesting']['test']));
		$this->assertEqual(Set::extract($a, '/Deep/Nesting/test'), $expected);
		$this->assertEqual(Set::extract($b, '/Deep/Nesting/test'), $expected);

		$expected = array(array('test' => $a[0]['Deep']['Nesting']['test']));
		$result = Set::extract($a, '/Deep/Nesting/test/1/..');
		$this->assertEqual($expected, $result);

		$expected = array(array('test' => $a[0]['Deep']['Nesting']['test']));
		$result = Set::extract($a, '/Deep/Nesting/test/2/and/../..');
		$this->assertEqual($expected, $result);

		$expected = array(array('test' => $a[0]['Deep']['Nesting']['test']));
		$result = Set::extract($a, '/Deep/Nesting/test/2/../../../Nesting/test/2/..');
		$this->assertEqual($expected, $result);

		$expected = array(2);
		$result = Set::extract($a, '/User[2]/id');
		$this->assertEqual($expected, $result);

		$expected = array(4, 5);
		$result = Set::extract($a, '/User[id>3]/id');
		$this->assertEqual($expected, $result);

		$expected = array(2, 3);
		$result = Set::extract($a, '/User[id>1][id<=3]/id');
		$this->assertEqual($expected, $result);

		$expected = array(array('I'), array('II'));
		$result = Set::extract($c, '/a/@*');
		$this->assertEqual($expected, $result);
	}