- Reverted the previous fix for portforward cleanup because it introduced a kubelet regression which can lead into segmentation faults. ([#102586](https://github.com/kubernetes/kubernetes/pull/102586), [@saschagrunert](https://github.com/saschagrunert)) [SIG API Machinery and Node]

        assertNull(topLevel.getCause().getCause().getCause().getCause());

        // Verify messages
        assertEquals("Top level", topLevel.getMessage());
        assertEquals("Level 1", level1.getMessage());
        assertEquals("Level 2", level2.getMessage());
        assertEquals("Level 3 - Root cause", level3.getMessage());
    }

    /**
     * Test serialization
     */

        });

        // Test throwing and catching with cause
        RuntimeException cause = new RuntimeException("Cause");
        TransportException thrown = assertThrows(TransportException.class, () -> {
            throw new TransportException(cause);
        });
        assertEquals(cause, thrown.getCause());

        // Test throwing and catching with message and cause

    @Test
    @DisplayName("Should provide correct cause for constructor with cause only")
    void testCauseOnlyConstructorMessage() {
        // Given
        RuntimeException cause = new RuntimeException("Specific cause message");

        // When
        RuntimeCIFSException exception = new RuntimeCIFSException(cause);

        // Then
        assertEquals(cause, exception.getCause());
        assertNotNull(exception.getMessage());

        // Then
        assertSame(cause, exception.getCause(), "Crypto cause should be preserved");
        assertEquals(cause.toString(), exception.getMessage(), "Message should be cause.toString() when only cause is provided");
    }

    @Test
    @DisplayName("Message and cause constructor should preserve both crypto parameters")
    void testMessageAndCauseConstructor() {

        }
    }

    @Test
    @DisplayName("Cause-only constructor: preserves provided cause; no interactions with cause")
    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");

        // IOException(Throwable) sets message to cause.toString()
        assertEquals(cause.toString(), ex.getMessage());
    }

    @Test
    @DisplayName("Should create SpnegoException with message and cause")
    void testWithMessageAndCause() {
        // Given
        String message = "SPNEGO handshake error";
        RuntimeException cause = new RuntimeException("root cause");

        // When

        assertNull(exception.getCause(), "Cause should be null for string constructor");
    }

    @Test
    void testThrowableConstructor() {
        // Test the constructor with a cause
        Throwable cause = new RuntimeException("Root cause of timeout");
        ConnectionTimeoutException exception = new ConnectionTimeoutException(cause);

        assertEquals(cause, exception.getCause(), "Cause should match the provided throwable");
    }

    @Test
    void testMessageAndCauseConstructor() {
        // Test the constructor with both message and cause arguments
        String message = "Test message with cause";
        Throwable cause = new IllegalArgumentException("Invalid argument");

        assertEquals(cause, exception.getCause());
    }

    @Test
    @DisplayName("Should create CIFSException with cause only")
    void testCIFSExceptionWithCauseOnly() {
        // Given
        Exception cause = new RuntimeException("Root cause");

        // When
        CIFSException exception = new CIFSException(cause);

        // Then
        assertNotNull(exception);
        assertEquals(cause, exception.getCause());