public void testPutIfAbsent_nullKeyUnsupported() {
    assertThrows(NullPointerException.class, () -> getMap().putIfAbsent(null, v3()));
    expectUnchanged();
    expectNullKeyMissingWhenNullKeysUnsupported(
        "Should not contain null key after unsupported putIfAbsent(null, value)");
  }

  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES)

   *
   * @param escaper the non-null escaper to test
   */
  public static void assertBasic(Escaper escaper) throws IOException {
    // Escapers operate on characters: no characters, no escaping.
    Assert.assertEquals("", escaper.escape(""));
    // Assert that escapers throw null pointer exceptions.
    try {
      escaper.escape((String) null);

        assertSame(user, chain.updateCalls.get(0));
    }

    // Test update with null user
    public void test_update_nullUser() {
        TestAuthenticationChain chain = new TestAuthenticationChain();
        chain.updateThrowsException = false;

        chain.update(null);

        assertEquals(1, chain.updateCalls.size());
        assertNull(chain.updateCalls.get(0));
    }

     * @param pathMappingList the path mapping list
     */
    public void setPathMappingList(final String sessionId, final List<PathMapping> pathMappingList) {
        if (sessionId != null) {
            if (pathMappingList != null) {
                pathMappingMap.put(sessionId, pathMappingList);
            } else {
                removePathMappingList(sessionId);
            }
        }
    }

    /**

                    return e;
                }
            }

            return null;
        }

        @SuppressWarnings({"unchecked", "checkstyle:methodlength"})
        private void traverseObjectWithParents(Class<?> cls, Object target) throws ModelInterpolationException {
            if (cls == null) {
                return;
            }

            if (cls.isArray()) {

        @Override
        public Path getPath() {
            return null;
        }

        @Override
        public Source resolve(String relative) {
            return null;
        }

        @Override
        @Nullable
        public ModelSource resolve(@Nonnull ModelLocator modelLocator, @Nonnull String relative) {
            return null;
        }
    }

    /**

        id = null;
        name = null;
        target = null;
        cronExpression = null;
        scriptType = null;
        crawler = null;
        jobLogging = null;
        available = null;
        sortOrder = null;
        createdBy = null;
        createdTime = null;
        versionNo = null;

    }

    /**

     * @return CURL request object or null if header is invalid
     */
    private CurlRequest getCurlRequest(final String header) {
        if (StringUtil.isBlank(header)) {
            return null;
        }

        final String[] values = header.split(" ");
        if (values.length != 2) {
            return null;
        }

        final String path;

        verifyNoMoreInteractions(renewable);
    }

    @Test
    @DisplayName("Edge: calling renew() on a null reference throws NPE")
    void renewOnNullReferenceThrowsNPE() {
        // Arrange: null reference to the interface
        SmbRenewableCredentials creds = null;

        // Act + Assert: invoking renew() on null triggers NullPointerException
        assertThrows(NullPointerException.class, () -> {

              "options": {
                "match": "null",
                "result": {
                  "text": "N/A"
                }
              },
              "type": "special"
            }
          ],
          "thresholds": {
            "mode": "percentage",
            "steps": [
              {
                "color": "green",
                "value": null
              }
            ]
          },