assertThrows(NullPointerException.class, () -> new SmbPipeOutputStream(null, tree));
        }

        @Test
        @DisplayName("Null tree handle triggers NullPointerException")
        void ctor_nullTree_throwsNPE() {
            // Arrange
            when(handle.getPipe()).thenReturn(pipe);

            // Act + Assert
            assertThrows(NullPointerException.class, () -> new SmbPipeOutputStream(handle, null));