test-exception2.java

public static class verfiyExceptionTest{  
  @Rule
  public ExpectedException thrown= ExpectedException.none();

  @Test
  public void throwsExceptionWithMessage() {
    // 預期 LoginFailed 會產生以及對應的 Exception message
    thrown.expect(LoginFailedException.class);
    thrown.expectMessage(startsWith("UserName"));

    // 執行測試
    checkEmptyUserName(StringUtils.Empty);
  }
}