public void MaxReturned() { //Arrange int[] elements = new int[] { 1, -5, 24, 561, -300, 15, 36, 82, 4, 50 }; BinarySearchTreeSet <int> bst = new BinarySearchTreeSet <int>(); foreach (int el in elements) { bst.Insert(el); } //Act int maxEl = bst.Max(); //Assert int actualMax = elements.Max(); Assert.Equal(actualMax, maxEl); }