expectUnchanged();
  }

  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testAddAll_emptyMultiset() {
    assertFalse(getMultiset().addAll(getSubjectGenerator().create()));
    expectUnchanged();
  }

  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testAddAll_nonEmptyList() {
    assertTrue(getMultiset().addAll(asList(e3(), e4(), e3())));

 * factory specifies what content should be expected to be read from a source or contained in a sink
 * given the content data that was used to create the source or that was written to the sink.
 *
 * <p>A single {@code SourceSinkFactory} implementation generally corresponds to one specific way of

    System {
      override fun create() = FileSystem.SYSTEM

      override val windows: Boolean
        get() = TestUtil.windows
    },

    FakeUnix {
      override fun create() = FakeFileSystem().apply { emulateUnix() }

      override val windows: Boolean
        get() = false
    },

    FakeWindows {
      override fun create() = FakeFileSystem().apply { emulateWindows() }

		debug.PrintStack()
		return metacache{}
	}

	// Grab a write lock, since we create one if we cannot find one.
	b.mu.Lock()
	defer b.mu.Unlock()

	// Check if exists already.
	if c, ok := b.caches[o.ID]; ok {
		c.lastHandout = time.Now()
		b.caches[o.ID] = c
		b.debugf("returning existing %v", o.ID)
		return c
	}

	if !o.Create {
		return metacache{
			id:     o.ID,
			bucket: o.Bucket,

		if err != nil {
			t.Fatalf("Test %d: failed to create test setup: %v", i, err)
		}
		disks := setup.disks
		erasure, err := NewErasure(t.Context(), test.dataBlocks, test.onDisks-test.dataBlocks, test.blocksize)
		if err != nil {
			t.Fatalf("Test %d: failed to create ErasureStorage: %v", i, err)
		}
		buffer := make([]byte, test.blocksize, 2*test.blocksize)

    /**
     * Transform header flag indicating the message is encrypted
     */
    public static final int TRANSFORM_FLAG_ENCRYPTED = 0x0001;

    /**
     * Create encryption context
     *
     * @param cipherId
     *            negotiated cipher identifier
     * @param dialect
     *            SMB dialect version
     * @param encryptionKey

    @Override
    protected void setUp(TestInfo testInfo) throws Exception {
        super.setUp(testInfo);

        // Create temp directory for testing
        tempDir = Files.createTempDirectory("thumbnail_test").toFile();
        tempDir.deleteOnExit();

        // Create a test thumbnail manager with minimal initialization
        thumbnailManager = new TestThumbnailManager();
        thumbnailManager.baseDir = tempDir;

                logger.info("User {} completed successfully: username={}, id={}", isUpdate ? "update" : "create", username, user.getId());
            }
        } catch (final Exception e) {
            logger.warn("Failed to {} user: username={}, id={}, error={}", isUpdate ? "update" : "create", username, user.getId(),
                    e.getMessage(), e);
            throw e;
        } finally {

    /**
     * Test for unwrap() method with matching type.
     * Verifies that unwrap returns the correct instance when the type matches.
     */
    @Test
    void testUnwrap_withMatchingType() {
        // Create a custom SmbTree type for testing
        CustomSmbTree customTree = mock(CustomSmbTree.class);
        when(smbTree.unwrap(CustomSmbTree.class)).thenReturn(customTree);

    private SrvCopychunk mockChunk;

    @BeforeEach
    void setUp() {
    }

    @Nested
    @DisplayName("Constructor Tests")
    class ConstructorTests {

        @Test
        @DisplayName("Should create instance with source key and single chunk")
        void testConstructorWithSingleChunk() {
            // Given
            byte[] sourceKey = new byte[SOURCE_KEY_SIZE];
            Arrays.fill(sourceKey, (byte) 0xAB);