app.replace_connector to ease tests

[ewjoachim]

Closes #1099

@medihack This is PR where I add app.replace_connector that should be the answer to the issue you raised. If you can check that it answers your issue.

Successful PR Checklist:

• [x] Tests
  • [ ] (not applicable?)
• [x] Documentation
  • [ ] (not applicable?)

PR label(s):

• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20breaking%20%F0%9F%92%A5
• [x] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20feature%20%E2%AD%90%EF%B8%8F
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20bugfix%20%F0%9F%95%B5%EF%B8%8F
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20miscellaneous%20%F0%9F%91%BE
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20dependencies%20%F0%9F%A4%96
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20documentation%20%F0%9F%93%9A

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Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
procrastinate
app.py
signals.py
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[medihack]

Thanks a lot, this works fine! There are still some other occurrences of app.defer(...) in the documentation (that's why I thought it may be outdated). I guess those must be replaced by task.defer(...) as well. Maybe we can also add some "pseudo" import like from mypackage.procrastinate import task (as in the production testing documentation) to make it more clear where the task object comes from (and maybe even name it my_task).

[ewjoachim]

I've added a commit that should hopefully answer your comments :)

[medihack]

Cool, thanks so much. Looks more consistent now. Let's merge and publish 🙂.