...However, in this case infrasturcture layer would become difficult to be covered with unit tests properly. For each individual HTTP request, we would need to introduce branching and test behavior that is not the part of the application itself. When some requrement will change and expected response will change also, we will need to reflect this in two different places — in the real workflow and in the loopback workflow. Moreover, every method that makes request to external API, needs to deal with the parameter that is not part of the business but the part of launch context. In sum, all this started smelling not really good to me, so I started thinking for some kind of different solution.