public void ckeckdiv() { int a = 4; int b = 4; int expected = a / b; int actual = obj.div(a, b); Assert.AreEqual(actual, expected, 0, "Result is wrong"); int a1 = 4; int b1 = 0; Assert.ThrowsException <System.DivideByZeroException>(() => obj.div(a1, b1)); }