fail("DocIds list should be immutable");
        } catch (UnsupportedOperationException e) {
            // Expected
        }
    }

    @Test
    public void test_indexesAreImmutable() {
        List<String> docIds = Arrays.asList("doc1", "doc2");
        List<Integer> indexes = Arrays.asList(1, 2);
        RelevanceEvaluationResult result = RelevanceEvaluationResult.withRelevantDocs(docIds, indexes);