Hands-On Software Engineering with Golang

Writing black-box tests

For the purpose of writing our black-box tests, we will start by examining the public interface of the retail package. A quick browse of the retail.go file reveals a NewPriceCalculator function that receives the URLs to the price and vat services as arguments and returns a PriceCalculator instance. The calculator instance can be used to obtain an item's VAT-inclusive price by invoking the PriceForItem method and passing the item's UUID as an argument. On the other hand, if we are interested in obtaining a VAT-inclusive item price for a particular date in the past, we can invoke the PriceForItemAtDate method, which also accepts a time period argument.

The black-box tests will live in a separate package with the name ...