/**
  * Test add alias
  */
 public function testAddAlias()
 {
     $this->assertEquals(0, count($this->object->getAliases()));
     $this->object->addAlias('-g');
     $this->assertEquals(1, count($this->object->getAliases()));
     $this->object->addAlias('-h');
     $this->assertEquals(2, count($this->object->getAliases()));
     $this->object->addAlias('-i');
     $this->assertEquals(3, count($this->object->getAliases()));
     $this->object->addAlias('-j');
     $this->assertEquals(4, count($this->object->getAliases()));
     $this->setExpectedException('Exception');
     $this->object->addAlias('-k');
 }