I need some help to understand writing test for async function For example I have a function def send_notification({:ok, nessage}, to, title, body) do Task.Supervisor.async_nolink(MyApp.TaskSupervisor, fn -> send(to, title, body) end) end def create(to, title, body) do to |> …

In manual mode, the sandbox works with Task behind the scenes to ensure that the task process gets allowed to share the connection with the caller. HOWEVER That means that the task cannot outlive the test process, or you’ll get the error you’re seeing. A quick way to check if this might be causin…

@al2o3cr Do you have advice about the best way to handle this in a test? I’ve got some code that uses Task.start to call some side effect functions that I don’t care about the results of. But my tests that uses the parent function are returning this error now, because the Task is trying to outlive t…

I’ve been fighting this exact same problem in some of the tests in a project at work. I’m not using the Task API, but I see the same problem when testing GenServers and with some async LiveViews. Our current approach is to have our tests safely kill the spawned process, and to ensure it has stopped…

Nowadays we have proper abstractions in place so this doesn’t happen as often. First, for managing connections, make sure you are using the start_owner API: todo_trek/test/support/data_case.ex at main · chrismccord/todo_trek · GitHub When you are starting processes under test, use start_supervisor…

[image] josevalim: When you are starting processes under test, use start_supervisor! from ExUnit, which guarantees it will be shut down before the test process. When searching for start_supervisor! in the docs I get no results: Search — ExUnit v1.20.2 ! Sorry, we couldn’t find anything for s…

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** (DBConnection.Error) owner #PID<> exited while testing async function

Questions & Help Questions

dimitarvp January 7, 2024, 11:15am 7

Yep, that’s the one.