assertFalse(iterator.hasNext(), "Should not have elements");
    }

    /**
     * Test that the iterator handles null return from next correctly.
     */
    @Test
    void testNullReturnFromNext() {
        // Given
        when(mockDelegate.hasNext()).thenReturn(false);

        DirFileEntryAdapterIterator iterator = new DirFileEntryAdapterIterator(mockParent, mockDelegate, null) {
            @Override