public void DiscountCounterCorrect()
{
var actual = ProductValidation.DiscountCounter(100, 10);
int expected = -90;
Assert.AreEqual(expected, actual);
}
public void DiscountCounterCorrectWithDouble()
{
var actual = ProductValidation.DiscountCounter(102.3, 10.23);
int expected = -90;
Assert.AreEqual(expected, actual);
}
public void DiscountCounterWhereAllArgumentsIsNull()
{
Assert.That(() => ProductValidation.DiscountCounter(null, null), Throws.TypeOf <ArgumentException>());
}