public void TestContains() { ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder <int>(); for (int i = 0; i < 4 * 8 * 8; i++) { int value = Generator.GetInt32(set.Count + 1); set.Add(i); // Use set.Contains(i) since this is a targeted collection API test #pragma warning disable xUnit2017 // Do not use Contains() to check if a value exists in a collection Assert.True(set.Contains(i)); #pragma warning restore xUnit2017 // Do not use Contains() to check if a value exists in a collection } set.Validate(ValidationRules.None); }