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						public function testKeyGeneration() {
		$this->assertEqual('comment_id', MockComment::key());
		$this->assertEqual(array('post_id', 'tag_id'), MockTagging::key());

		$result = MockComment::key(array('comment_id' => 5, 'body' => 'This is a comment'));
		$this->assertEqual(array('comment_id' => 5), $result);

		$result = MockTagging::key(array(
			'post_id' => 2,
			'tag_id' => 5,
			'created' => '2009-06-16 10:00:00'
		));
		$this->assertEqual('id', MockPost::key());
		$this->assertEqual(array('id' => 5), MockPost::key(5));
		$this->assertEqual(array('post_id' => 2, 'tag_id' => 5), $result);
	}