assertNotNull(exception);
        assertNull(exception.getCause());
        assertNull(exception.getMessage());
    }

    /**
     * Test constructor with various cause types
     */
    public void test_constructor_withVariousCauseTypes() {
        // With Exception cause
        Exception exceptionCause = new Exception("Exception cause");

        new Suppression(c1, c3Exception, c1Exception));
  }

  public static void testSuppressingSuppressor() throws IOException {
    Closer closer = Closer.create();

    IOException thrownException = new IOException();
    IOException c1Exception = new IOException();
    RuntimeException c2Exception = new RuntimeException();

        // All threads should fail with the same IOException (project ID is blank)
        // But importantly, there should be no race condition errors
        assertEquals(threadCount, failureCount.get());
        assertEquals(0, successCount.get());

        // All exceptions should be about project ID being blank
        for (Exception e : exceptions) {
            assertTrue(e instanceof IOException);

        new Suppression(c1, c3Exception, c1Exception));
  }

  public static void testSuppressingSuppressor() throws IOException {
    Closer closer = Closer.create();

    IOException thrownException = new IOException();
    IOException c1Exception = new IOException();
    RuntimeException c2Exception = new RuntimeException();

        // All threads should fail with the same IOException (endpoint is blank)
        // But importantly, there should be no race condition errors
        assertEquals(threadCount, failureCount.get());
        assertEquals(0, successCount.get());

        // All exceptions should be about endpoint being blank
        for (Exception e : exceptions) {
            assertTrue(e instanceof IOException);

        @DisplayName("Should handle deeply nested exceptions")
        void testToStringWithNestedExceptions() {
            Exception innermost = new IOException("Innermost exception");
            Exception middle = new RuntimeException("Middle exception", innermost);
            Exception rootCause = new IllegalStateException("Outer exception", middle);
            TransportException exception = new TransportException("Transport failed", rootCause);

    }

    @Test
    void testDuplicatePluginExecution() throws Exception {
        SimpleProblemCollector result = validateRaw("duplicate-plugin-execution.xml");

        assertViolations(result, 0, 4, 0);

        assertContains(result.getErrors().get(0), "duplicate execution with id a");
        assertContains(result.getErrors().get(1), "duplicate execution with id default");

    }

    // Error case: disconnect throws IOException
    @Test
    @DisplayName("disconnect throws IOException when underlying close fails")
    void disconnect_throwsIOException() throws Exception {
        doThrow(new java.io.IOException("close error")).when(transport).disconnect(true, true);
        java.io.IOException ex = assertThrows(java.io.IOException.class, () -> transport.disconnect(true, true));

        void testGetSessionKey_ThrowsCIFSException() throws Exception {
            DcerpcPipeHandle handle = createMockedDcerpcPipeHandle();
            CIFSException exception = new CIFSException("Test exception");
            when(mockSmbPipeHandleInternal.getSessionKey()).thenThrow(exception);
            assertThrows(CIFSException.class, handle::getSessionKey);
        }
    }

        executor.shutdown();

        // Then - No unexpected exceptions
        assertTrue(exceptions.isEmpty(), "No unexpected exceptions should occur");
    }

    /**
     * Test that CopyOnWriteArrayList prevents ConcurrentModificationException.
     */
    @Test
    public void testNoConcurrentModificationException() throws Exception {
        // Given