Tests that ChangedCommand objects can be constructed and rendered.
function testChangedCommand() {
$command = new ChangedCommand('#page-title', '#page-title-changed');
$expected = array(
'command' => 'changed',
'selector' => '#page-title',
'asterisk' => '#page-title-changed',
);
$this
->assertEqual($command
->render(), $expected, 'ChangedCommand::render() returns a proper array.');
}