@Test
 public void testSecretAsUser() {
   Security.login("me");
   try {
     secretDataHolder.getData();
     fail();
   } catch (Exception e) {
     // Ok
   }
 }
 @Test
 public void testSecretAsAdmin() {
   Security.login("admin");
   assertThat(secretDataHolder.getData()).isEqualTo("secret");
 }
 @Test
 public void testPublicAsAdmin() {
   Security.login("admin");
   assertThat(publicDataHolder.getData()).isEqualTo("public");
 }