} else {
                System.clearProperty(Constants.FESS_SEARCH_ENGINE_HTTP_ADDRESS);
            }
        }
    }

    @Test
    public void test_utilityClass_pattern() {
        // Verify utility class design pattern compliance

        // 1. Class should be final (or have private constructor)
        Constructor<?>[] constructors = SystemUtil.class.getDeclaredConstructors();

        } catch (NoSuchMethodException e) {
            fail("All expected public methods should exist: " + e.getMessage());
        }
    }

    @Test
    public void test_utilityClass_pattern() {
        // Verify utility class design pattern compliance

        // 1. Class should have protected constructor
        Constructor<?>[] constructors = ThreadDumpUtil.class.getDeclaredConstructors();