Richard van der Hoff 8388a7fb3a Make _make_callback_with_userinfo async
... so that we can test its behaviour when it raises.

Also pull it out to the top level so that I can use it from other test classes.
2020-12-15 23:10:59 +00:00
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2014-08-12 15:10:52 +01:00
2020-12-02 17:53:38 +00:00
2020-12-02 17:53:38 +00:00