has() public method

주어진 아이디를 가진 플러그인이 있는지 조사한다.
public has ( string $id ) : boolean
$id string plugin id
return boolean
 /**
  * @depends testConstruct
  */
 public function testHas(PluginCollection $collection)
 {
     $this->assertTrue($collection->has('plugin_sample'));
     $this->assertTrue($collection->has('plugin_sample2'));
     $this->assertFalse($collection->has('plugin_sample3'));
 }