Add testing workflow and use `pytest` #7

	# Github action definitions for unit-tests with PRs.

	name: tft-unit-tests
	on:
	pull_request:
	branches: [ master ]
	paths-ignore:
	- '**.md'
	- 'docs/**'
	workflow_dispatch:

	jobs:
	unit-tests:
	if: github.actor != 'copybara-service[bot]'
	runs-on: ubuntu-latest
	timeout-minutes: 60

	strategy:
	matrix:
	python-version: ['3.9', '3.10', '3.11']

	steps:
	- uses: actions/checkout@v4

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	cache: 'pip'
	cache-dependency-path: \|
	setup.py

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install --upgrade wheel setuptools
	python -m pip install .[test]

	- name: Run unit tests
	shell: bash
	run: \|
	pytest

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