* @throws IllegalArgumentException if {@code occurrences} is negative, or if this operation would
   *     result in more than {@link Integer#MAX_VALUE} occurrences of the element
   * @throws NullPointerException if {@code element} is null and this implementation does not permit
   *     null elements. Note that if {@code occurrences} is zero, the implementation may opt to
   *     return normally.
   */
  @CanIgnoreReturnValue

        DataStoreException withNPE = new DataStoreException("NPE Error", new NullPointerException("Null value"));
        DataStoreException withCustom = new DataStoreException("Custom Error", new FessSystemException("System error"));

        assertTrue(withIOException.getCause() instanceof java.io.IOException);
        assertTrue(withNPE.getCause() instanceof NullPointerException);
        assertTrue(withCustom.getCause() instanceof FessSystemException);

        }

        @Test
        @DisplayName("Should throw NullPointerException with null configuration")
        void testConstructorWithNullConfig() {
            // The parent class requires a non-null configuration for getPid()
            assertThrows(NullPointerException.class, () -> {
                new Trans2GetDfsReferralResponse(null);
            });
        }
    }

    }
  }

  public void testReadFully() throws IOException {
    byte[] b = new byte[10];

    assertThrows(
        NullPointerException.class, () -> ByteStreams.readFully(newTestStream(10), null, 0, 10));

    assertThrows(NullPointerException.class, () -> ByteStreams.readFully(null, b, 0, 10));

    assertThrows(

   * @throws IllegalArgumentException if {@code occurrences} is negative, or if this operation would
   *     result in more than {@link Integer#MAX_VALUE} occurrences of the element
   * @throws NullPointerException if {@code element} is null and this implementation does not permit
   *     null elements. Note that if {@code occurrences} is zero, the implementation may opt to
   *     return normally.
   */
  @CanIgnoreReturnValue

            fail("Should throw NullPointerException for null input");
        } catch (NullPointerException e) {
            // Expected behavior
        }
    }

    @Test
    public void test_parse_null_input() {
        // Test null input handling
        try {
            KuromojiCSVUtil.parse(null);
            fail("Should throw NullPointerException for null input");

      return comparator;
    }
    return NATURAL_ORDER;
  }

  @Override
  public boolean containsKey(Object key) {
    try {
      return delegate.containsKey(checkValid(key));
    } catch (NullPointerException | ClassCastException e) {
      return false;
    }
  }

  @Override
  public boolean containsValue(Object value) {
    return delegate.containsValue(value);
  }

  @Override

        final VaMessenger<FessMessages> messageCode = messages -> messages.addErrorsInvalidQueryUnknown(UserMessages.GLOBAL_PROPERTY_KEY);

        final NullPointerException npeCause = new NullPointerException("Null query parameter");
        final IllegalStateException iseCause = new IllegalStateException("Invalid parser state");
        final OutOfMemoryError oomCause = new OutOfMemoryError("Query too large");

        User user = createTestUser("testuser");
        try {
            authenticationManager.insert(user);
            fail("Should throw NullPointerException when processing null chain");
        } catch (NullPointerException e) {
            // Expected behavior when null chain is processed
            assertTrue(true);
        }
    }

    // Test chains order preservation
    @Test

    @DisplayName("Invalid: resolving class by null name throws NPE")
    void testClassForNameWithNull() {
        // Intent: demonstrate defensive behavior with null when resolving this type by name
        assertThrows(NullPointerException.class, () -> Class.forName(null));
    }

    @Test
    @DisplayName("Happy path: class is loadable via fully qualified name")
    void testClassForName() throws Exception {
        // Act