getAliases() public method

The aliases are sorted alphabetically in ascending order.
public getAliases ( ) : string[]
return string[] The command names indexed and sorted by their aliases.
 public function testGetAliases()
 {
     $ls = new Command(CommandConfig::create('ls')->addAlias('ls-alias'));
     $cd = new Command(CommandConfig::create('cd')->addAlias('cd-alias'));
     $this->collection->add($ls);
     $this->collection->add($cd);
     $this->assertSame(array('cd-alias' => 'cd', 'ls-alias' => 'ls'), $this->collection->getAliases());
 }