assertThrows(NullPointerException.class, () -> new NetServerEnumIterator(null, treeHandle, "*", 0, null));
    }

    @Test
    @DisplayName("Constructor should handle null tree handle")
    void testConstructor_NullTreeHandle_ThrowsNPE() throws Exception {
        // Given: Valid parent but null tree handle
        when(locator.getType()).thenReturn(SmbConstants.TYPE_WORKGROUP);
        when(locator.getURL()).thenReturn(createSmbURL("smb://"));