public function testMerge()
{
$this->collection->add($ls = new Command(new CommandConfig('ls')));
$this->collection->merge(array($cd = new Command(new CommandConfig('cd')), $cat = new Command(new CommandConfig('cat'))));
$this->assertSame(array('ls' => $ls, 'cd' => $cd, 'cat' => $cat), $this->collection->toArray());
}