public void IsValidEmptyProductIdShouldReturnFalse()
{
var discount = new SalesLineItemDiscount()
{
Discount = "$10",
EffectiveFrom = DateTime.Now.AddHours(-1),
EffectiveTo = DateTime.Now.AddHours(1),
ProductId = "", // cannot have empty product ids
ThresholdQuantity = 1
};
Assert.That(discount.IsValid(), Is.False, "Empty product ID should be invalid.");
}
public void IsValidNegativeThresholdQuantityShouldReturnFalse()
{
var discount = new SalesLineItemDiscount()
{
Discount = "$10",
EffectiveFrom = DateTime.Now.AddHours(-1),
EffectiveTo = DateTime.Now.AddHours(1),
ProductId = "Greek Salad",
ThresholdQuantity = -1 // cannot have non-positive thresholds
};
Assert.That(discount.IsValid(), Is.False, "Non-positive threshold quantities should be invalid.");
}
public void IsValidNegativeAbsoluteDiscountShouldReturnFalse()
{
var discount = new SalesLineItemDiscount()
{
Discount = "-10", // cannot have negative discounts
EffectiveFrom = DateTime.Now.AddHours(-1),
EffectiveTo = DateTime.Now.AddHours(1),
ProductId = "Granola",
ThresholdQuantity = 3
};
Assert.That(discount.IsValid(), Is.False, "Negative discounts should be invalid.");
}
public void IsValidEffectiveToLessThanEffectiveFromShouldReturnFalse()
{
var discount = new SalesLineItemDiscount()
{
Discount = "$10",
EffectiveFrom = DateTime.Now.AddHours(5),
EffectiveTo = DateTime.Now.AddHours(-5), // Cannot have To < From
ProductId = "Tuna Salad",
ThresholdQuantity = 1
};
Assert.That(discount.IsValid(), Is.False,
"'Effective' time period should start at 'From' and end at to 'To'.");
}