Now that we're using pytest more aggressively, I think we should start transitioning our tests to that style rather than continuing to use unittest. This PR removes some unnecessary uses of unittest I found.
I kept the test classes (while removing the inheritance from unittest.TestCase) where I felt like it added structure or logical grouping of tests.
I verified that pytest still finds all the tests in both this branch and master by running commands like:
```
pytest $(git diff --name-only master | grep -v windows_installer_integration_tests)
```
I want to use isort as part of https://github.com/certbot/certbot/issues/9572 because I want to do it programmatically, however, I felt like the config needed to be tweaked a bit due to it not understanding what is and is not our own code.
This PR updates the isort config so it recognizes our own modules and runs `isort .` from the root of the repo to update everything.
* update isort config
* run "isort ."
* Remove Windows 2016 environment, generate 64 bit installer
* Add note to changelog
* Use win_amd64 as installer suffix
* Bump PYTHON_BITNESS to 64
* Require 64 bit Windows for the installer_build job
* Update certbot install path
* update windows test name
* Base installer suffix on PYTHON_BITNESS again
* Update changelog to request users uninstall old version
There are still some left, but the `modification_check` test fails. Some are still in `tools`, and they can probably be removed as well. `with_statement` was introduced officially in Python 2.5, so there's really old stuff in the code base.
As discussed in #7539, we need proper tests of the Windows installer itself in order to variety that all the logic contained in a production-grade runtime of Certbot on Windows is correctly setup by each version of the installer, and so for a variety of Windows OSes.
This PR handles this requirement. The new `windows_installer_integration_tests` module in `certbot-ci` will:
* run the given Windows installer
* check that Certbot is properly installed and working
* check that the scheduled renew task is set up
* check that the scheduled task actually launch the Certbot renew logic
The Windows nightly tests are updated accordingly, in order to have the tests run on Windows Server 2012R2, 2016 and 2019.
These tests will evolve as we add more logic on the installer.
* Configure an integration test testing the windows installer
* Write the test module
* Configurable installer path, prepare azure pipelines
* Fix option
* Update test_main.py
* Add confirmation for this destructive test
* Use regex to validate certbot --version output
* Explicit dependency on a log output
* Use an exception to ask confirmation
* Use --allow-persistent-changes
