public void testContains_nullNotContainedButQueriesSupported() {
    assertFalse("contains(null) should return false", collection.contains(null));
  }

  @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
  public void testContains_nullNotContainedAndUnsupported() {
    expectNullMissingWhenNullUnsupported("contains(null) should return false or throw");
  }

  @CollectionFeature.Require(ALLOWS_NULL_VALUES)

    }

    @Test
    @DisplayName("encode should throw NPE on null input")
    void testEncodeNull() {
        assertThrows(NullPointerException.class, () -> Base64.encode(null));
    }

    @Test
    @DisplayName("decode should throw NPE on null input")
    void testDecodeNull() {
        assertThrows(NullPointerException.class, () -> Base64.decode(null));
    }

     * @param coordinates array of {@link ArtifactCoordinates}
     * @return {@link ArtifactResolverResult}
     * @throws ArtifactResolverException in case of an error.
     * @throws IllegalArgumentException in case of parameter {@code buildingRequest} is {@code null} or
     *             parameter {@code coordinates} is {@code null} or invalid
     */

        assertEquals("0.0.0.0", unknownName.getName(), "Unknown name should be 0.0.0.0");
    }

    @Test
    @DisplayName("Should handle null hostname in getByName")
    void testGetByNameWithNull() {
        // When/Then
        assertThrows(UnknownHostException.class, () -> {
            nameServiceClient.getByName(null);

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        .testEquals();
  }

  @AndroidIncompatible // Android forbids null parent ClassLoader
  public void testClassPathEntries_emptyURLClassLoader_noParent() {
    assertThat(ClassPath.getClassPathEntries(new URLClassLoader(new URL[0], null)).keySet())
        .isEmpty();
  }

  @AndroidIncompatible // Android forbids null parent ClassLoader
  public void testClassPathEntries_urlClassLoader_noParent() throws Exception {

        @Test
        @DisplayName("Should handle null values in toString")
        void testToStringWithNulls() {
            String result = referralData.toString();

            assertTrue(result.contains("server=null"));
            assertTrue(result.contains("share=null"));
            assertTrue(result.contains("link=null"));
            assertTrue(result.contains("path=null"));
        }
    }

    @Nested

                if (document == null) {
                    storeChildUrlsToQueue(urlQueue, getChildUrlSet(searchEngineClient, id));
                    return true;
                }

                final Date expires = DocumentUtil.getValue(document, fessConfig.getIndexFieldExpires(), Date.class);
                if (expires != null && expires.getTime() < systemHelper.getCurrentTimeAsLong()) {

            assertTrue(s1.isEmpty());
            // isBlank will fail if sub_authority is null, so we skip that check for s1

            // All-zero subauthorities
            byte[] ident = new byte[] { 0, 0, 0, 0, 0, 0 };
            rpc.sid_t st = buildSidT((byte) 1, ident, 0, 0);
            SID s2 = new SID(st, jcifs.SID.SID_TYPE_USE_NONE, null, null, false);
            assertFalse(s2.isEmpty());
            assertTrue(s2.isBlank());

            final boolean runAll = webConfigIdList == null && fileConfigIdList == null && dataConfigIdList == null;

            Thread webFsCrawlerThread = null;
            Thread dataCrawlerThread = null;

            if (runAll || webConfigIdList != null || fileConfigIdList != null) {
                webFsCrawlerThread = new Thread((Runnable) () -> {
                    // crawl web