assertArrayEquals(new byte[0], session.getSessionKey());
        assertNull(session.getSessionKey());
        verify(session, times(3)).getSessionKey();
    }

    // Error propagation: getSessionKey throws CIFSException
    @Test
    @DisplayName("getSessionKey throws CIFSException on failure")
    void getSessionKey_throws() throws CIFSException {

    }

    /**
     * Verify that root causes are stored and returned correctly.
     */
    @Test
    @DisplayName("Root cause propagation")
    void testRootCausePropagation() {
        Throwable root = mock(Throwable.class);
        SmbException ex = new SmbException(0, root);
        assertSame(root, ex.getRootCause());
    }

    /**

    void causeOnlyConstructor_preservesCause_andNoInteractions() {
        // Arrange & Act
        SMBProtocolDecodingException ex = new SMBProtocolDecodingException(mockCause);

        // Assert cause propagation
        assertSame(mockCause, ex.getCause(), "Cause should be exactly the provided instance");

        // Access common Throwable methods to exercise paths without touching the cause

        assertFalse(transport.isSigningEnforced());
        verify(transport).isSigningOptional();
        verify(transport).isSigningEnforced();
    }

    // Error propagation: signing checks may throw SmbException
    @Test
    @DisplayName("signing checks propagate SmbException")
    void signingChecks_throw() throws Exception {

            assertTrue((inheritOnly & ACE.FLAGS_INHERIT_ONLY) != 0, "Should include inherit only flag");

            // No propagation
            int noPropagation = ACE.FLAGS_OBJECT_INHERIT | ACE.FLAGS_NO_PROPAGATE;
            assertTrue((noPropagation & ACE.FLAGS_NO_PROPAGATE) != 0, "Should include no propagate flag");
        }
    }

    @Nested
    @DisplayName("Interface Edge Case Handling")

- Added request header UID propagation, behind an alpha `RemoteRequestHeaderUID` feature gate. ([#129081](https://github.com/kubernetes/kubernetes/pull/129081), [@stalz](https://github.com/stlaz)) [SIG API SIG API Machinery, cluster lifecycle, testing]

### Failing Test

    private final Future<?> delegate;

    FutureAsCancellable(Future<?> delegate) {
      this.delegate = delegate;
    }

    @Override
    @SuppressWarnings("Interruption") // We are propagating an interrupt from a caller.
    public void cancel(boolean mayInterruptIfRunning) {
      delegate.cancel(mayInterruptIfRunning);
    }

    @Override
    public boolean isCancelled() {

    private final Future<?> delegate;

    FutureAsCancellable(Future<?> delegate) {
      this.delegate = delegate;
    }

    @Override
    @SuppressWarnings("Interruption") // We are propagating an interrupt from a caller.
    public void cancel(boolean mayInterruptIfRunning) {
      delegate.cancel(mayInterruptIfRunning);
    }

    @Override
    public boolean isCancelled() {

            assertNotNull(recvBuffer, "Receive buffer should be allocated");
            assertTrue(recvBuffer.getSize() > 0, "Receive buffer should have positive size");

            // Test data preparation
            byte[] testData = "Test RDMA data transfer".getBytes();
            sendBuffer.getBuffer().put(testData);
            sendBuffer.getBuffer().flip();

### Refactors

* ♻️ Refactor deciding if `embed` body fields, do not overwrite fields, compute once per router, refactor internals in preparation for Pydantic models in `Form`, `Query` and others. PR [#12117](https://github.com/fastapi/fastapi/pull/12117) by [@tiangolo](https://github.com/tiangolo).

### Internal