public void AddFee_WhenAmountIsNotPositiveNumber_ShouldReturnNull()
{
// Arrange
var fee = new Fee("Free", DateTime.Now, 100M);
var feeType = new DiscountedFee(_merchantDiscounts);
// Act
var result = feeType.AddFee(fee);
// Assert
Assert.Null(result);
}
public void AddFee_WhenMerchantIsEligibleDiscount_ShouldApplyDiscount(string merchantName, float expectedAmount)
{
// Arrange
var fee = new Fee(merchantName, DateTime.Now, 1M);
var feeType = new DiscountedFee(_merchantDiscounts);
// Act
var result = feeType.AddFee(fee);
// Assert
Assert.NotNull(result);
Assert.Equal((decimal)expectedAmount, result.Amount);
}
public void AddFee__WhenMerchantIsNotEligibleDiscount_ShouldNotChangeFeeAmount()
{
// Arrange
var expectedAmount = 100M;
var fee = new Fee("XYZ", DateTime.Now, expectedAmount);
var feeType = new DiscountedFee(_merchantDiscounts);
// Act
var result = feeType.AddFee(fee);
// Assert
Assert.NotNull(result);
Assert.Equal(expectedAmount, result.Amount);
}
