function testCanAddAChildToXmlObject() { $xml = new T_Xml('<root>data</root>'); $xml_child = $xml->addChild('child', 'value'); $expect = new T_Xml_Element('<root>data</root>'); $expect_child = $expect->addChild('child', 'value'); $this->assertSame($xml->asXml(), $expect->asXml()); $this->assertEquals($xml_child->asXml(), $expect_child->asXml()); }