How to test a database call when using asynchronous task like GenServer.cast(...)?

[LostKobrakai]

You can also read into the following topic, which also discusses a few tactics to test async operations:

Test processes using handle_continue

Background I have a process that does nothing in it’s init function and delegates all the work to a handle_continue. I do this because the work being done in the handle_continue is quite heavy, and since this is a Worker process, I don’t want to slog it’s supervisor (and thus the entire application) with the slow initialization of a Worker (of which there can be hundreds or thousands of). Problem The problem here comes when testing. When using ExUnit, it will execute the code assertions right a…