public void Test_doCalcul() { string sign = "*"; Calculator tempcalcul = new Calculator(); decimal dec = 0; switch (sign) { case "-": tempcalcul.Minus(dec); break; case "*": tempcalcul.Multiply(dec); break; case "/": tempcalcul.Divide(dec); break; default: tempcalcul.Sum(dec); break; } Assert.Equal(0, tempcalcul.result); }