Test processes using handle_continue

Aside:

What is that rationale for this structure?

			dumper: %{
				save_failed_request: fn url ->
					send(test, {:dumper, :save_failed_request, [url]})
					{:ok, :saved}
				end
			},
			metrics: %{
				inc: fn id ->
					send(test, {:metrics, :inc, [id]})
					{:ok, 1}
				end
			}

It seems a bit JavaScript-y/Object-y. If these callbacks only exist for test monitoring purposes, it should be possible to unify them into one single function using pattern matching and putting the arguments into a keyword list. (Then it should be possible to wrap it in a macro to remove the function calls from production code (similar to :compile_time_purge_matching ) - though I’ve never done it).