Add tox.ini to easily test multiple Python versions (#343)

Co-authored-by: Alex Waygood <[email protected]>

.github/workflows/ci.yml

@@ -24,18 +24,17 @@ jobs:
           allow-prereleases: true
           cache: pip
           cache-dependency-path: |
+            .github/workflows/ci.yml
             dev-requirements.txt
             requirements.txt
 
       - name: Install dependencies
         run: |
-          python3 -m pip install -U -r dev-requirements.txt
+          python3 -m pip install -U coverage tox
 
       - name: Tests
         run: |
-          python3 -m coverage run -m pytest
-          python3 -m coverage report
-          python3 -m coverage xml
+          tox -e py
 
       - name: Upload coverage
         uses: codecov/codecov-action@v3

pytest.ini

@@ -1,5 +1,12 @@
 [pytest]
-addopts = --strict-config --strict-markers
+addopts =
+    --strict-config
+    --strict-markers
+    --cov blurb_it
+    --cov tests
+    --cov-report html
+    --cov-report term
+    --cov-report xml
 xfail_strict = True
 asyncio_mode = auto
 filterwarnings = error

tox.ini

@@ -0,0 +1,13 @@
+[tox]
+requires =
+    tox>=4.2
+env_list =
+    py{312, 311, 310, 39, 38}
+
+[testenv]
+pass_env =
+    FORCE_COLOR
+commands_pre =
+    {envpython} -m pip install -U -r dev-requirements.txt
+commands =
+    {envpython} -m pytest {posargs}