public void Add_Ok(int a, int b, int sum)
{
MathOp math = new MathOp();
var ret = math.Add(a, b);
Assert.True(sum == ret);
}
public void Div_Ok(double a, double b, double result)
{
MathOp math = new MathOp();
var ret = math.Div(a, b);
Assert.True(ret == result);
Assert.Throws <DivideByZeroException>(() => math.Div(3, 0));
}