assertNotNull(result);
        // The mock returns a fixed count of 3
        assertTrue(result.contains("documents"));
    }

    // Test with empty label set
    @Test
    public void test_execute_withEmptyLabelSet() {
        // Override mock to return empty label set
        LabelTypeHelper emptyLabelHelper = new LabelTypeHelper() {
            @Override
            public Set<String> getMatchedLabelValueSet(String url) {