}

        @Test
        @DisplayName("should handle null versions in comparison")
        void shouldHandleNullVersionsInComparison() {
            assertFalse(ModelVersionUtils.isVersionGreaterOrEqual(null, "4.1.0"));
            assertFalse(ModelVersionUtils.isVersionGreaterOrEqual("4.1.0", null));
            assertFalse(ModelVersionUtils.isNewerThan410(null));
        }
    }

    @Nested

   *
   * @return {@code first} if it is non-null; otherwise {@code second} if it is non-null
   * @throws NullPointerException if both {@code first} and {@code second} are null
   * @since 18.0 (since 3.0 as {@code Objects.firstNonNull()}).
   */
  public static <T> T firstNonNull(@Nullable T first, @Nullable T second) {
    if (first != null) {
      return first;
    }
    if (second != null) {
      return second;
    }

   *
   * @throws NullPointerException if the element is null
   * @since 6.0 (source-compatible since 2.0)
   */
  public static <E> ImmutableMultiset<E> of(E e1) {
    return copyFromElements(e1);
  }

  /**
   * Returns an immutable multiset containing the given elements, in order.
   *
   * @throws NullPointerException if any element is null
   * @since 6.0 (source-compatible since 2.0)
   */

    assertTrue(multimap().remove(getKeyForNullValue(), null));

    expectMissing(mapEntry(getKeyForNullValue(), (V) null));
    assertGet(getKeyForNullValue(), ImmutableList.of());
  }

  @MapFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_KEY_QUERIES})
  public void testRemoveNullKeyAbsent() {
    assertFalse(multimap().remove(null, v0()));
    expectUnchanged();
  }

        delete(file);
      }
    }
    filesToDelete.clear();
  }

  private File getTestDir() throws IOException {
    if (testDir != null) {
      return testDir;
    }

    URL testFileUrl = IoTestCase.class.getResource("testdata/i18n.txt");
    if (testFileUrl == null) {
      throw new RuntimeException("unable to locate testdata directory");
    }

    if (testFileUrl.getProtocol().equals("file")) {
      try {

    assertTrue(multimap().remove(getKeyForNullValue(), null));

    expectMissing(mapEntry(getKeyForNullValue(), (V) null));
    assertGet(getKeyForNullValue(), ImmutableList.of());
  }

  @MapFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_KEY_QUERIES})
  public void testRemoveNullKeyAbsent() {
    assertFalse(multimap().remove(null, v0()));
    expectUnchanged();
  }

                    e.getLocation().getColumnNumber(),
                    e);
        }
    }

    private boolean isStrict(Map<String, ?> options) {
        Object value = (options != null) ? options.get(IS_STRICT) : null;
        return value == null || Boolean.parseBoolean(value.toString());
    }

    // 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);
  }

  /**

    public MetadataRetrievalException(String message) {
        this(message, null, null);
    }

    public MetadataRetrievalException(Throwable cause) {
        this(null, cause, null);
    }

    public MetadataRetrievalException(String message, Throwable cause) {
        this(message, cause, null);
    }

    public MetadataRetrievalException(String message, Throwable cause, ArtifactMetadata artifact) {

     * @param options possible parsing options, may be {@code null}
     * @return an optional parsed {@link Model} or {@code null} if none could be found
     * @throws ModelParserException if the located model cannot be parsed
     */
    @Nonnull
    default Optional<Model> locateAndParse(@Nonnull Path dir, @Nullable Map<String, ?> options)
            throws ModelParserException {