--breakpoint flag changes the behaviour of mix test using bypass

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Is it possible that when ran without breakpoints the test finishes before the process makes the call. While with breakpoints, by the time you press c, Manage.login/2 makes its way to send the message?

I’d try to synchronize the test and Bypass with something like:

test "logs in user correctly", %{bypass: bypass, credentials: credentials} do
  test_pid = self()

  Bypass.expect_once(bypass, fn conn ->
    IO.inspect(conn.request_path, label: "REQ PATH")
    IO.inspect(conn.method, label: "METHOD")
  
    send(test_pid, :logging_in)
    
    Plug.Conn.resp(conn, 429, ~s<{"errors": [{"code": 88, "message": "Rate limit exceeded"}]}>)
  end)
  
  _manager_pid = start_link_supervised!(ManagerSupervisor)
  Manager.login(credentials, false)

  # this ensures that the test will not exit until the message is received
  # (or until the default `assert_receive` timeout 100ms)
  assert_receive :logging_in
end
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