assertEquals(cause, exception.getRootCause(), "getRootCause() should return the same cause as getCause().");
    }

    /**
     * Test getErrorCode() method.
     */
    @Test
    void testGetErrorCode() {
        int errorCode = 0x00000005; // DCERPC_FAULT_ACCESS_DENIED
        DcerpcException exception = new DcerpcException(errorCode);

        assertEquals(100, mockResponse.getGrantedCredits());

        // Verify the method was called
        verify(mockResponse, times(1)).getGrantedCredits();
    }

    @Test
    void testGetErrorCode() {
        // Simulate error code
        when(mockResponse.getErrorCode()).thenReturn(-1);
        assertEquals(-1, mockResponse.getErrorCode());

        // Verify the method was called