AvlNode<E> newTop = pred();
        // newTop is the maximum node in my left subtree
        newTop.left = left.removeMax(newTop);
        newTop.right = right;
        newTop.distinctElements = distinctElements - 1;
        newTop.totalCount = totalCount - oldElemCount;
        return newTop.rebalance();
      } else {
        AvlNode<E> newTop = succ();

        List<Integer> indexes = Arrays.asList(1, 2);
        RelevanceEvaluationResult result = RelevanceEvaluationResult.withRelevantDocs(docIds, indexes);

        try {
            result.getRelevantDocIds().add("newDoc");
            fail("DocIds list should be immutable");
        } catch (UnsupportedOperationException e) {
            // Expected
        }
    }

    @Test
    public void test_indexesAreImmutable() {

		t.Fatalf("delete auto_increment_struct fail, err: %v", err)
	}

	newRow := &AutoIncrementStruct{}
	if err := DB.Create(newRow).Error; err != nil {
		t.Fatalf("create auto_increment_struct fail, err: %v", err)
	}

	AssertEqual(t, newRow.ID, lastID+1)
}

// https://github.com/go-gorm/gorm/issues/5320
func TestPrimarykeyID(t *testing.T) {