Unit test Wio Terminal "could not open port" while testing

Thanks a lot for that hint! It works. Now I can also run unit tests.

I had to modify the script a little bit to work with python 3:

Import("env")

def after_upload(source, target, env):
    print("Delay while uploading...")
    import time
    time.sleep(1)
    print("Done!")

env.AddPostAction("upload", after_upload)
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