public void TestCanAddTwoIntegers()
{
int input1 = 1;
int input2 = 2;
int expected = 3;
Addition operation_class = new Addition();
Assert.AreEqual(expected, operation_class.Add(input1, input2)); // "Add" must be defined.
}
public void CanAddTwoNegativeNumbers()
{
int input1 = -1;
int input2 = -4;
int expected = -5;
Addition operation_class = new Addition();
Assert.AreEqual(expected, operation_class.Add(input1, input2));
}