nthock
Testing Task Async
Hi everyone,
I am trying to test a function where in it call an async task. For example:
def some_function() do
Task.async(fn -> do_something() end)
return "something else"
end
How am I going to test that do_something() is being called? Let’s just assume for this case I need to return “something else” and not the task pid.
Most Liked
LostKobrakai
Task.async needs to do something your test can observe. Most often people make the code in the async send a message to the test process or another location, which is known and can be observed.
PragTob
Exactly. Mostly/the way I do it is to configure the module called once for the test environment and once for the other environments. You can then test that the Task.async executes the module, but still unit test the “real” module implementation. Best to make them both adopt the same behaviour to make sure nothing goes wrong.
Glancing over it, this blog post describes the interchangeable implementations I’m referencing: https://semaphoreci.com/community/tutorials/a-practical-guide-to-test-doubles-in-elixir
Popular in Questions
Other popular topics
Latest on Elixir Forum
Sponsor Spotlight
Enabling companies to succeed by building software people love.
Categories:
Sub Categories:
Forums
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Practical resources that improve the lives of professional developers.
Producing high quality Elixir screencasts since 2017.
The deployment platform built for Elixir: PaaS ease, VPS control.
Courses that'll move you from confusion to "Aha, now I get it!"