Replace the last use of pbr with modern packaging #219

	name: Unit Tests

	on:
	- push
	- pull_request

	jobs:
	unittest:
	runs-on: ubuntu-latest

	strategy:
	matrix:
	python-version:
	- 3.8
	- 3.9
	- '3.10'
	- 3.11
	- 3.12

	steps:
	- uses: actions/checkout@v3

	- uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	architecture: 'x64'

	- uses: actions/cache@v2
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}-${{ hashFiles('test-requirements.txt') }}

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -r requirements.txt -r test-requirements.txt
	pip install -e .

	- name: Test Testtools
	run: python -m testtools.run discover

	- name: Test PyTest
	run: pytest tests/pytest

	oldest:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3

	- uses: actions/setup-python@v4
	with:
	python-version: '3.8'
	architecture: 'x64'

	- uses: actions/cache@v3
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-oldest-${{ hashFiles('oldest-requirements.txt') }}-${{ hashFiles('test-requirements.txt') }}

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -r oldest-requirements.txt -r test-requirements.txt
	pip install -e .

	- name: Test Testtools
	run: python -m testtools.run discover

	- name: Test PyTest
	run: pytest tests/pytest

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