verify(mockFilter).accept(mockResource3);
    }

    /**
     * Test that adapt method is actually used by the iterator.
     */
    @Test
    void testAdaptMethodIsUsed() {
        // Given
        when(mockDelegate.hasNext()).thenReturn(true, false);
        when(mockDelegate.next()).thenReturn(mockFileEntry1);

        // Create iterator with custom adapt implementation