.put(IllegalStateException.class, e -> e instanceof IllegalStateException)
          .put(IndexOutOfBoundsException.class, e -> e instanceof IndexOutOfBoundsException)
          .put(NoSuchElementException.class, e -> e instanceof NoSuchElementException)
          .put(NullPointerException.class, e -> e instanceof NullPointerException)

        // Test that FessUserNotFoundException is an instance of FessSystemException
        FessUserNotFoundException exception = new FessUserNotFoundException("testuser");

        assertTrue(exception instanceof FessSystemException);
        assertTrue(exception instanceof RuntimeException);
        assertTrue(exception instanceof Exception);
        assertTrue(exception instanceof Throwable);
    }

          .put(IllegalArgumentException.class, e -> e instanceof IllegalArgumentException)
          .put(IllegalStateException.class, e -> e instanceof IllegalStateException)
          .put(IndexOutOfBoundsException.class, e -> e instanceof IndexOutOfBoundsException)
          .put(NoSuchElementException.class, e -> e instanceof NoSuchElementException)

          .put(IllegalStateException.class, e -> e instanceof IllegalStateException)
          .put(IndexOutOfBoundsException.class, e -> e instanceof IndexOutOfBoundsException)
          .put(NoSuchElementException.class, e -> e instanceof NoSuchElementException)
          .put(NullPointerException.class, e -> e instanceof NullPointerException)

          .put(IllegalStateException.class, e -> e instanceof IllegalStateException)
          .put(IndexOutOfBoundsException.class, e -> e instanceof IndexOutOfBoundsException)
          .put(NoSuchElementException.class, e -> e instanceof NoSuchElementException)
          .put(NullPointerException.class, e -> e instanceof NullPointerException)

          .put(IllegalStateException.class, e -> e instanceof IllegalStateException)
          .put(IndexOutOfBoundsException.class, e -> e instanceof IndexOutOfBoundsException)
          .put(NoSuchElementException.class, e -> e instanceof NoSuchElementException)
          .put(NullPointerException.class, e -> e instanceof NullPointerException)

          .put(IllegalStateException.class, e -> e instanceof IllegalStateException)
          .put(IndexOutOfBoundsException.class, e -> e instanceof IndexOutOfBoundsException)
          .put(NoSuchElementException.class, e -> e instanceof NoSuchElementException)
          .put(NullPointerException.class, e -> e instanceof NullPointerException)

        // Verify inheritance chain
        assertTrue(queryParseException instanceof QueryParseException);
        assertTrue(queryParseException instanceof FessSystemException);
        assertTrue(queryParseException instanceof RuntimeException);
        assertTrue(queryParseException instanceof Exception);
        assertTrue(queryParseException instanceof Throwable);
    }

    public void test_nullHandling() {

        } catch (Exception e) {
            // Expected - utility classes should have private constructors
            assertTrue(e instanceof IllegalAccessException || e.getCause() instanceof IllegalAccessException
                    || e instanceof InstantiationException);
        }
    }

    public void test_constants_and_static_methods() {
        // Verify all public static methods exist

        assertNotNull(connection2, "Second connection should not be null.");
        assertTrue(connection1 instanceof NtlmHttpURLConnection, "First connection should be wrapped.");
        assertTrue(connection2 instanceof NtlmHttpURLConnection, "Second connection should be wrapped.");
    }