Document how to create ExUnit tests for a responder about hedwig HOT 2 CLOSED

EDIT: I just noticed you recently (january :)) moved TestRobot and RobotCase in lib, which makes them available when downloaded from hex.
It resolves the module loading problem (I updated the issue accordingly), but i still get the same error concerning the empty mailbox.

from hedwig.

We sorted this out in Slack but I thought I would add the comments here for historical reasons. You're missing the responders: config in your @tag. It should read something like: @tag start_robot: true, name: "edgar", responders: [{YOUR_MODULE_NAME, []}].

It might be worthwhile to add some documentation about this in the README or in module docs to help others avoid this problem in the future. We also discussed defaulting to the mix config for responders but I'm not sure what the ramifications of that might be. @scrogson would know better then me.

from hedwig.