long apply(FileEntry e);
    }

    // --- Mockito-based interaction tests ---

    @Test
    @DisplayName("Mocked FileEntry returns stubbed values and verifies interactions")
    void mockedEntry_happyPath_and_interactions() {
        // Arrange: stub all methods with representative values
        when(mockEntry.getName()).thenReturn("file.txt");
        when(mockEntry.getType()).thenReturn(1);