@Test
        @DisplayName("Should handle null context")
        void testNullContext() {
            // Given
            when(transportPool.getSmbTransport(null, address, DEFAULT_PORT, false)).thenReturn(null);

            // When
            SmbTransport result = transportPool.getSmbTransport(null, address, DEFAULT_PORT, false);

            // Then
            assertEquals(null, result);
        }

        @Test

    static ArtifactInstallerRequest build(Session session, Collection<ProducedArtifact> artifacts) {
        return builder()
                .session(requireNonNull(session, "session cannot be null"))
                .artifacts(requireNonNull(artifacts, "artifacts cannot be null"))
                .build();
    }

    @NotThreadSafe
    class ArtifactInstallerRequestBuilder {
        Session session;
        RequestTrace trace;

            return null;
        }

        @Override
        public org.lastaflute.job.subsidiary.RegisteredJob registerNonCron(Class<? extends org.lastaflute.job.LaJob> jobType,
                org.lastaflute.job.subsidiary.JobConcurrentExec concurrentExec, org.lastaflute.job.subsidiary.InitialCronOpCall opLambda) {
            return null;
        }

        @Override

        });
    }

    @Test
    public void testValidString() throws Exception {
        validator.validateString("normal string", 100, "test");
        validator.validateString(null, 100, "test"); // Null should be allowed
        // Should pass without exception
    }

    @Test
    public void testStringTooLong() throws Exception {
        String longString = "a".repeat(300);

        File outputFile = new File("test.jpg");
        assertFalse(emptyGenerator.generate("thumbnailId", outputFile));
        assertFalse(emptyGenerator.generate(null, outputFile));
        assertFalse(emptyGenerator.generate("thumbnailId", null));
        assertFalse(emptyGenerator.generate(null, null));
    }

    public void test_destroy() {
        // Initialize without container
        emptyGenerator = new EmptyGenerator();

  public void testAddAllAtIndex_nullSupported() {
    List<E> containsNull = singletonList(null);
    assertTrue("addAll(n, containsNull) should return true", getList().addAll(0, containsNull));
    /*
     * We need (E) to force interpretation of null as the single element of a
     * varargs array, not the array itself
     */
    expectAdded(0, (E) null);
  }

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)

   *
   * @param element the element to add one occurrence of; may be null only if explicitly allowed by
   *     the implementation
   * @return {@code true} always, since this call is required to modify the multiset, unlike other
   *     {@link Collection} types
   * @throws NullPointerException if {@code element} is null and this implementation does not permit
   *     null elements

    protected void finalize() throws Throwable {
        try {
            // Add null check to prevent NPE if object was not fully constructed
            if (this.usageCount != null && this.usageCount.get() != 0) {
                log.warn("Tree handle was not properly released, performing emergency cleanup: "
                        + (this.resourceLoc != null ? this.resourceLoc.getURL() : "unknown"));
                emergencyReleaseHandle();

        if (methodArgs == null || methodArgs.length == 0) {
            return "";
        }
        final StringBuilder buf = new StringBuilder(100);
        for (final Object arg : methodArgs) {
            if (arg != null) {
                buf.append(arg.getClass().getName());
            } else {
                buf.append("null");
            }
            buf.append(", ");
        }

    for (; ; ) {
      Cell[] as;
      Cell a;
      int n;
      long v;
      if ((as = cells) != null && (n = as.length) > 0) {
        if ((a = as[(n - 1) & h]) == null) {
          if (busy == 0) { // Try to attach new Cell
            Cell r = new Cell(x); // Optimistically create
            if (busy == 0 && casBusy()) {
              boolean created = false;