I’ve been trying to replace Bypass + Mox with TestServer, and I really appreciate the simplification and ease of understanding it brought back to my tests 
The one case that’s been bugging me and preventing me from shipping it is how to handle a test involving Phoenix.Presence. As far as I understand, depending on timing/scheduling my test server gets hit with a different number of requests.
If I TestServer.add one too little I get a warning in the test output, even though the test passes:
warning: ** (RuntimeError) TestServer.Instance #PID<0.471.0> received an unexpected GET request at /v1/users/79e78660-718c-4f59-8e4c-51b61599d868
If I TestServer.add one too many, then the test fails:
(RuntimeError) TestServer.Instance #PID<0.465.0> did not receive a request for these routes before the test ended
Is there a blessed way in TestServer to say “this handler should match at least once (or N times)?”
Alternatively, any other ideas of what I could consider doing? Thanks!
