Sudoku.Chooselv4.selectedlv C# (CSharp) Method

        public int selectedlv(String txtlv)
        {
            if (txtlv.Equals("Easy"))
            {
                return 7;

            }
            else if (txtlv.Equals("Normal"))
            {
                return 6;

            }
            else if (txtlv.Equals("Hard"))
            {
                return 5;

            }
            else
            {
                return 0;
            }
        }

 public void test4x4Choose()
 {
     LevelChooser lv = new Chooselv4();
     Assert.AreEqual(7,lv.selectedlv("Easy"));
     Assert.AreEqual(6, lv.selectedlv("Normal"));
     Assert.AreEqual(5, lv.selectedlv("Hard"));
 }