Tests that CloseDialogCommand objects can be constructed and rendered.
function testCloseDialogCommand() {
$command = new CloseDialogCommand('#some-dialog');
$expected = array(
'command' => 'closeDialog',
'selector' => '#some-dialog',
);
$this
->assertEqual($command
->render(), $expected, 'CloseDialogCommand::render() with a selector returns a proper array.');
}