public void Test10Valid2Div4()
 {
     Assert.AreEqual("2.00", Ex2fCalculations.Calc10("2", "4"));
 }
 public void Test10InputB0()
 {
     Assert.AreEqual("Invalid input", Ex2fCalculations.Calc10("1", "0"));
 }
 public void Test10Valid4Div2()
 {
     Assert.AreEqual("2.00", Ex2fCalculations.Calc10("4", "2"));
 }
 public void Test10BInputEmpty()
 {
     Assert.AreEqual("Invalid input", Ex2fCalculations.Calc10("2", ""));
 }