public function testBooleanValues()
{
$doc = new Document(array('model' => $this->_model));
$doc->tall = false;
$doc->fat = true;
$doc->set(array('hair' => true, 'fast' => false));
$expected = array('fast', 'fat', 'hair', 'tall');
$result = array_keys($doc->data());
sort($result);
$this->assertEqual($expected, $result);
}