public function testUpdate() {
		$entity = new Record(array(
			'model' => $this->_model,
			'data' => array('id' => 1, 'title' => 'new post', 'body' => 'the body'),
			'exists' => true
		));
		$query = new Query(compact('entity') + array('type' => 'update'));
		$result = $this->db->update($query);

		$this->assertTrue($result);
		$this->assertEqual(1, $query->entity()->id);

		$expected = "UPDATE {mock_database_posts} SET";
		$expected .= " {id} = 1, {title} = 'new post', {body} = 'the body' WHERE id = 1;";
		$this->assertEqual($expected, $this->db->sql);
	}