Benjamin-Philip
Get mix task output so far for tests
I am writing a new (sub)task for the hex client, which I have some trouble testing.
The task has some output, using which I need to make a HTTP POST request (in the test).
The task will only complete after I make the HTTP request.
Now, how do I get the mix output so far, so that I can write tests for this task.
I have noticed that in the hex tests that prompt inputs are mocked as follows:
https://github.com/hexpm/hex/blob/main/test/mix/tasks/hex.user_test.exs#L53-L57
Perhaps I can send a :mix_shell_output msg and receive a response?
PS: I also didn’t find any docs for this idiom.
Marked As Solved
stefanchrobot
Sorry for the confusion. I did misread the question. Seems Mix.Shell.Process is exactly what you need:
This is mainly useful in tests, allowing us to assert if given messages were received or not instead of performing checks on some captured IO. Since we need to guarantee a clean slate between tests, there is also a
flush/1function responsible for flushing all:mix_shellrelated messages from the process inbox.
It’s not Hex-specific at all.
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Benjamin-Philip
I talked to Eric (@ericmj) about this.
Turns out that all mix shell output is sent to the test process.
That means I can for example do things like this:
recieve do
{:mix_shell, :info, [msg | _ ]} -> IO.inspect(msg)
end
Or an assert_recieved:
assert_received {:mix_shell, :info, ["Some description\n"]}
Do note that I am unsure if this solution is hex specific or not.
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