public void No_Special_Characters_Allowed_In_User_Name() { //Arrange List<Users> user = new List<Users>(); Users t = new Users(); user.Add(new Users()); //Act // if (Name.All(char.IsLetterOrDigit)) //{ // user.Add(new Users()); //} // else // { // throw new FormatException(); // } //Assert Assert.IsFalse(t.Add_User("Bengt").Contains("@#$åäö")); }