initMultimapWithNullKey();
    assertContains(multimap().entries(), mapEntry((K) null, getValueForNullKey()));
  }

  @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
  public void testContainsEntryWithNullKeyAbsent() {
    assertFalse(multimap().entries().contains(mapEntry(null, v0())));
  }

  @CollectionSize.Require(absent = ZERO)
  @MapFeature.Require(ALLOWS_NULL_VALUES)

                        },
                        "price": {
                            "title": "Price",
                            "type": "number",
                        },
                        "tax": {
                            "title": "Tax",
                            "anyOf": [{"type": "number"}, {"type": "null"}],
                        },

     * @param settings The settings to validate, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */
    void validate(Settings settings, SettingsProblemCollector problems);

    /**
     * Validate the specified settings.
     *
     * @param settings The settings to validate, must not be {@code null}.

    // Parse the address, and make sure the length/version is correct.
    Scope scope = parseScope ? new Scope() : null;
    byte[] addr = ipStringToBytes(ipString, scope);
    if (addr == null || addr.length != expectBytes) {
      return null;
    }

    return bytesToInetAddress(addr, (scope != null) ? scope.scope : null);
  }

  /**

            final HttpSession session = r.getSession(false);
            if (session != null) {
                return session.getId();
            }
            final String preference = r.getParameter("preference");
            if (preference != null) {
                return Integer.toString(preference.hashCode());
            }

      @ParametricNullness V value) {
    if (value == null) {
      // This cast is safe because null is assignable to V for all V (i.e. it is bivariant)
      @SuppressWarnings("unchecked")
      ListenableFuture<V> typedNull = (ListenableFuture<V>) ImmediateFuture.NULL;
      return typedNull;
    }
    return new ImmediateFuture<>(value);
  }

  /**

        if (data == null) {
            throw new CIFSException("Data cannot be null");
        }
        return compress(data, 0, data.length, algorithm);
    }

    @Override
    public byte[] compress(byte[] data, int offset, int length, int algorithm) throws CIFSException {
        if (data == null) {
            throw new CIFSException("Data cannot be null");
        }

    }

    @Test
    @DisplayName("Test getResumeKey returns null before decode")
    void testGetResumeKeyBeforeDecode() {
        assertNull(response.getResumeKey(), "Resume key should be null before decode");
    }

    @Test
    @DisplayName("Test decode with all zero bytes")

    multimap().put(k3(), null);

    assertGet(k3(), Lists.newArrayList((V) null)); // ImmutableList.of can't take null.
    assertEquals(size + 1, multimap().size());
  }

  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES)
  public void testPutNullValue_unsupported() {
    assertThrows(NullPointerException.class, () -> multimap().put(k1(), null));

    expectUnchanged();
  }

                try {
                    failure.set(null);
                    systemRegistry.cleanUp();
                    Thread commandThread = new Thread(() -> {
                        try {
                            systemRegistry.execute(reader.readLine(
                                    context.cwd.get().getFileName().toString() + " mvnsh> ",
                                    null,