====== JUnit Rules ======
  * [[https://github.com/junit-team/junit/wiki/Rules|JUnit Rules]]
  * [[http://www.threeriversinstitute.org/blog/?p=155|Interceptors in JUnit]]
  * [[http://java.dzone.com/articles/junit-rules-0|JUnit Rules]]
  * [[http://cwd.dhemery.com/2010/12/junit-rules/|Using Rules to Influence JUnit Test Execution]]
  * [[http://www.alexecollins.com/tutorial-junit-rule/|Alex Collins - Tutorial: JUnit @Rule]]
  * [[http://blog.schauderhaft.de/2009/10/04/junit-rules/|JUnit new feature Rules]]

===== Exception Rule =====
  * 예외 발생 여부와 발생한 예외 종류를 검증할 수 있는 Rule

<code java>
  @Rule
  public ExpectedException exception = ExpectedException.none();

  @Test
  public void throwsIllegalArgumentExceptionIfIconIsNull() {
    // 발생할 예외에 대한 조건 기술
    exception.expect(IllegalArgumentException.class);
    exception.expectMessage("Negative value not allowed");
    
    ClassToBeTested t = new ClassToBeTested();
    t.methodToBeTest(-1);
  }
</code>

===== 임시 폴더 Rule =====
  * 테스트 별로 임시 폴더를 생성한다.
<code java>
  @Rule
  public TemporaryFolder folder = new TemporaryFolder();
  
  // ...

  File createdFolder = folder.newFolder("newfolder");
  File createdFile = folder.newFile("myfilefile.txt");  
</code>

===== External Resource Rule =====
  * 외부 리소스 초기화/종료를 처리하는 룰.
  * 대부분의 Custom Rule은 External Resource Rule을 상속 받아 만들어도 충분한 경우가 많다.
<code java>
public static class UsesExternalResource {
  Server myServer = new Server();

  @Rule
  public ExternalResource resource = new ExternalResource() {
    @Override
    protected void before() throws Throwable {
      myServer.connect();
    };

    @Override
    protected void after() {
      myServer.disconnect();
    };
  };

  @Test
  public void testFoo() {
    new Client().run(myServer);
  }
}
</code>

===== System Rules =====
  * http://stefanbirkner.github.io/system-rules/