public void TestUnion() { var mySet1 = new Set<int>(); mySet1.Add(1); mySet1.Add(2); var mySet2 = new Set<int>(); mySet2.Add(3); mySet1.UnionOfSets(mySet2); Assert.IsTrue(mySet1.IsExist(1) && mySet1.IsExist(2) && mySet1.IsExist(3)); }