List<LogNotificationEvent> events = new ArrayList<>();
        events.add(new LogNotificationEvent(timestamp, "ERROR", "org.codelibs.fess.TestClass", "Something went wrong", null));

        String details = testableJob.testFormatDetails(events);

        assertNotNull(details);
        assertTrue(details.contains("Total: 1 event(s)"));
        assertTrue(details.contains("ERROR"));
        assertTrue(details.contains("org.codelibs.fess.TestClass"));