assertNotNull(result);
        assertEquals(1, result.size());
        assertEquals("   ", result.get(0));
    }

    @Test
    public void testGetAsListWithListContainingNulls() {
        // Test with list containing null elements
        List<String> listWithNulls = new ArrayList<>();
        listWithNulls.add("valid");
        listWithNulls.add(null);