### Question:
NotificationIds { public static int getNewMailSummaryNotificationId(Account account) { return getBaseNotificationId(account) + OFFSET_NEW_MAIL_SUMMARY; }  static int getNewMailSummaryNotificationId(Account account); static int getNewMailStackedNotificationId(Account account, int index); static int getFetchingMailNotificationId(Account account); static int getSendFailedNotificationId(Account account); static int getCertificateErrorNotificationId(Account account, boolean incoming); static int getAuthenticationErrorNotificationId(Account account, boolean incoming);  }### Answer:
@Test public void getNewMailSummaryNotificationId_withDefaultAccount() throws Exception { Account account = createMockAccountWithAccountNumber(0); int notificationId = NotificationIds.getNewMailSummaryNotificationId(account); assertEquals(6, notificationId); }
@Test public void getNewMailSummaryNotificationId_withSecondAccount() throws Exception { Account account = createMockAccountWithAccountNumber(1); int notificationId = NotificationIds.getNewMailSummaryNotificationId(account); assertEquals(21, notificationId); }