Cannot wait (with timeout) for expectations about bypass HOT 4 OPEN

When the external request is not the thing you are testing, you may be interested in using the stub/4 function. It was added specifically for this case.

Added here #58

Bypass.stub(bypass, "POST", "/1.1/statuses/update.json", fn conn ->
  Agent.get_and_update(AgentModule, fn step_no -> {step_no, step_no + 1} end)
  Plug.Conn.resp(conn, 429, ~s<{"errors": [{"code": 88, "message": "Rate limit exceeded"}]}>)
end)

from bypass.

This would be great! I have this problem when testing async work triggered by AMQP messages. My current workaround for this goes like:

test "something" do
  test = self()
  Bypass.expect(bypass, "POST", "/endpoint", fn conn ->
    send(test, :request_done)
    # ...response
  end)

  trigger_work()

  # Wait for the message
  assert_received :request_done, :timer.seconds(3)
end

In case that helps anyone.

EDIT: This technique isn't reliable in all circumstances because the test can still end before the process finishes 😕. Which in my cases leads to a failure as the test is supervising and shuts down the process abnormally. send_after could be used as a band-aid.

from bypass.

I just tripped exactly over the same stuff and was looking through the docs on how to solve this.
@danielemegna happy to help if you want to takle this issue!

from bypass.

@Odaeus I use the same technique, which is actually accepted in the community, cosidering that it's also suggested in the documentation of the Mox library.

In my case I usually do the following:

test "something" do
  parent = self()
  ref = make_ref()

  Bypass.expect(bypass, "POST", "/endpoint", fn conn ->
    # ...response
    send(parent, {ref, :sent})
  end)

  trigger_work()

  assert_receive {^ref, :sent}
end

from bypass.