TEST: Fix plugin invocation, use an initializer that can be verified #880
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Follow-up to #876, which didn't actually test what we wanted it to. We were manually calling
print()inside the test and interpreting that as being run on process initialization. We need to pass the config toMultiProcPlugin(), notworkflow.run().capsysdoes not capture stdout from subprocesses, it seems, so instead I'm telling the subprocesses to touch a file that I choose.