public void CalculateDiscount_CouponOfTypePercentageAndHigherThan100_ThrowInvalidCouponException()
{
var target = new CouponEngine();
Assert.Throws <InvalidCouponException>(
() => target.CalculateDiscount(CreateCheckOutDto(total: 200), CreateCoupon(value: 101, couponType: CouponType.Percentage)));
}
public void CalculateDiscount_CouponHasNegativeValue_ThrowInvalidCouponException()
{
var target = new CouponEngine();
Assert.Throws <InvalidCouponException>(
() => target.CalculateDiscount(CreateCheckOutDto(total: 10), CreateCoupon(value: -10)));
}
public void CalculateDiscount_CouponHasValueGreaterThanShoppingCartTotal_ThrowInvalidCouponException()
{
var target = new CouponEngine();
Assert.Throws <InvalidCouponException>(
() => target.CalculateDiscount(CreateCheckOutDto(total: 10), CreateCoupon(value: 20)));
}
public void CalculateDiscount_CouponHasExpired_ThrowCouponExpiredException(CouponType couponType)
{
var target = new CouponEngine();
Assert.Throws <CouponExpiredException>(() =>
target.CalculateDiscount(CreateCheckOutDto(), CreateCoupon(couponType: couponType, expiration: DateTime.Now.AddDays(-1))));
}
public void CalculateDiscount_CouponOfTypeFreeShipping_ReturnShippingCost()
{
var target = new CouponEngine();
var actual = target.CalculateDiscount(CreateCheckOutDto(shippingCost: 10), CreateCoupon(couponType: CouponType.FreeShipping));
Assert.Equal(10, actual);
}
public void CalculateDiscount_CouponOfTypePercentageAndHigherThanAmount_DoNotThrowInvalidCouponException()
{
var target = new CouponEngine();
var actual = target.CalculateDiscount(CreateCheckOutDto(total: 10), CreateCoupon(value: 50, couponType: CouponType.Percentage));
Assert.Equal(5, actual);
}
public void CalculateDiscount_CouponOfTypePercentage_ReturnPercentageOfTotal()
{
var target = new CouponEngine();
var actual = target.CalculateDiscount(CreateCheckOutDto(total: 200), CreateCoupon(value: 10, couponType: CouponType.Percentage));
Assert.Equal(20, actual);
}
public void CalculateDiscount_CouponHasAmountValue_ReturnNumber(double amount)
{
var target = new CouponEngine();
var actual = target.CalculateDiscount(CreateCheckOutDto(total: 10), CreateCoupon(value: amount));
Assert.Equal(amount, actual);
}
public void CalculateDiscount_CouponIsNull_Return0()
{
var target = new CouponEngine();
var actual = target.CalculateDiscount(CreateCheckOutDto(), null);
Assert.Equal(0, actual);
}
public void CalculateDiscount_CouponIsNull_Return0()
{
// We could have used auto mocking container here as well, however at the moment this initialization is simple as it is
var target = new CouponEngine();
var actual = target.CalculateDiscount(CreateCheckOutDto(), null);
Assert.Equal(0, actual);
}
public void When_Coupon_Is_Null_Return_Zero()
{
var sut = new CouponEngine();
var shoppingCartDto = new ShoppingCartDto()
{
Id = "1", Items = Utility.GenerateListOfDtoItems()
};
var checkout = new CheckoutDto(shoppingCartDto, 10, 1, 100);
var result = sut.CalculateDiscount(checkout, null);
result.Should().Be(0);
}
public void Coupon_Calculated_As_A_Percentage()
{
var sut = new CouponEngine();
var shoppingCartDto = new ShoppingCartDto()
{
Id = "1", Items = Utility.GenerateListOfDtoItems()
};
var checkout = new CheckoutDto(shoppingCartDto, 10, 1, 10);
var result = sut.CalculateDiscount(checkout,
new Coupon()
{
Amount = 2, Type = CouponType.Percentage, ExpiryDate = DateTime.Now.AddDays(10)
});
result.Should().Be(20);
}
public void Coupon_Cannot_Be_Greater_Than_Cart_Total()
{
var sut = new CouponEngine();
var shoppingCartDto = new ShoppingCartDto()
{
Id = "1", Items = Utility.GenerateListOfDtoItems()
};
var checkout = new CheckoutDto(shoppingCartDto, 10, 1, 10);
Action result = () => sut.CalculateDiscount(checkout, new Coupon()
{
Amount = 100, ExpiryDate = DateTime.Now.AddDays(-60)
});
result.Should().Throw <CouponExpiredException>()
.WithMessage("Coupon past 30 days and has expired.");
}
public void Coupon_No_More_Than_OneHundred()
{
var sut = new CouponEngine();
var shoppingCartDto = new ShoppingCartDto()
{
Id = "1", Items = Utility.GenerateListOfDtoItems()
};
var checkout = new CheckoutDto(shoppingCartDto, 20, 10, 200);
Action result = () => sut.CalculateDiscount(checkout,
new Coupon()
{
Amount = 100, Type = CouponType.Percentage, ExpiryDate = DateTime.Now.AddDays(10)
});
result.Should().Throw <InvalidCouponException>()
.WithMessage("Coupon amount cannot be equal to 100.");
}
public void Coupon_Cannot_Be_A_Negative_Number()
{
var sut = new CouponEngine();
var shoppingCartDto = new ShoppingCartDto()
{
Id = "1", Items = Utility.GenerateListOfDtoItems()
};
var checkout = new CheckoutDto(shoppingCartDto, 10, 1, 10);
Action result = () => sut.CalculateDiscount(checkout,
new Coupon()
{
Amount = -2, ExpiryDate = DateTime.Now.AddDays(10)
});
result.Should().Throw <InvalidCouponException>()
.WithMessage("Coupon amount cannot be negative.");
}
