Tests that AddCssCommand objects can be constructed and rendered.
function testAddCssCommand() {
$command = new AddCssCommand('p{ text-decoration:blink; }');
$expected = array(
'command' => 'add_css',
'data' => 'p{ text-decoration:blink; }',
);
$this
->assertEqual($command
->render(), $expected, 'AddCssCommand::render() returns a proper array.');
}