assertEquals(100L, mock.length());
    }

    @Nested
    @DisplayName("Edge case values")
    class EdgeCases {

        @Test
        @DisplayName("Null name is allowed via mock")
        void nullName() {
            FileEntry mock = mock(FileEntry.class);
            when(mock.getName()).thenReturn(null);
            assertNull(mock.getName());
        }

        @Test