public void Calculate()
{
Subtracter calculator = new Subtracter();
double result = calculator.Calculate(10, 5);
Assert.AreEqual(5, result);
}
public void SubtracterTest()
{
Subtracter calculator = new Subtracter();
double result = calculator.Calculate(6, 5);
Assert.AreEqual(1, result);
}
public void TestSubtracter()
{
IExpression e = new Subtracter(new Constant(1.0), new Constant(2.0));
Assert.AreEqual(-1, e.Calculate());
}
