public void It_should_add_numbers()
{
var calc = new Calculator();
var sum = calc.Add(1, 1);
sum.Should().Be(2);
}
public void It_should_add_and_subtract_numbers()
{
var calc = new Calculator();
int sum = calc.Add(1, 1);
int answer = calc.Subtract(sum, 1);
answer.Should().Be(1);
}