Sudoku.Chooselv9.selectedlv C# (CSharp) Method

        public int selectedlv(String txtlv)
        {
            if (txtlv.Equals("Easy"))
                {
                    return 50;

                }
                else if (txtlv.Equals("Normal"))
                {
                    return 40;

                }
                else if (txtlv.Equals("Hard"))
                {
                    return 30;

                }
                else
                {
                    return 0;
                }
        }

 public void test9x9Choose()
 {
     LevelChooser lv = new Chooselv9();
     Assert.AreEqual(50, lv.selectedlv("Easy"));
     Assert.AreEqual(40, lv.selectedlv("Normal"));
     Assert.AreEqual(30, lv.selectedlv("Hard"));
 }