public void Breadth_First_returns_tree_value_in_level_order() { // Arrange BinarySearchTree tree = new BinarySearchTree(); tree.Add(6); tree.Add(2); tree.Add(7); tree.Add(3); tree.Add(10); tree.Add(1); tree.Add(9); tree.Add(20); // ___6___ // / \ // 2 7 // / \ \ // 1 3 10 // / \ // 9 20 //Breadth_First list: 6, 2, 7, 1, 3, 10, 9, 20 // Act IEnumerable <int> result = tree.Breadth_First(); // Assert int[] expected = new int[] { 6, 2, 7, 1, 3, 10, 9, 20 }; Assert.Equal(expected, result); }