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After a discussion in the core developers channel, we have decided to
migrate from `pytest` to `unittest` as the testing framework. This
commit sets up the repository to use `unittest` and migrates the
first couple of tests files to the new framework.
What I have done to migrate to `unitest`:
- Removed all `pytest` test files, since they are incompatible.
- Removed `pytest`-related dependencies from the Pipfile.
- Added `coverage.py` to the Pipfile dev-packages and relocked.
- Added convenience scripts to Pipfile for running the test suite.
- Adjust to `azure-pipelines.yml` to use `coverage.py` and `unittest`.
- Migrated four test files from `pytest` to `unittest` format.
In addition, I've added five helper Mock subclasses in `helpers.py`
and created a `TestCase` subclass in `base.py` to add an assertion
that asserts that no log records were logged within the context of
the context manager. Obviously, these new utility functions and
classes are fully tested in their respective `test_` files.
Finally, I've started with an introductory guide for writing tests
for our bot in `README.md`.
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Sebastiaan Zeeff