How do you define ‘talks to the API’ here? If for example your module uses HTTPoison (or similar), do you consider this all under your control, so use Bypass, or would you mock out HTTPoison (or perhaps your HTTPoison.Base callback module)?
Background: I find myself uncertain in concrete cases, similarly to @neuone, re which approach to take (as I sometimes do with behaviours vs protocols). I tend to start by analogy with other languages I’ve used, but then the analogies don’t seem too convincing. I probably need to read more good Elixir code.
