Use tox to run flake8/black/mypy

.github/workflows/python-build-test.yml

@@ -18,23 +18,11 @@ jobs:
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
-
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install flake8 pytest mypy black
-          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-      - name: Lint with flake8
-        run: |
-          flake8 src/pyprojroot tests
-      - name: MyPy (type) checking
-        run: |
-          mypy --strict src/pyprojroot
-      - name: Format with black
-        run: |
-          black --check --diff src/pyprojroot tests
-      - name: Test with pytest
-        run: |
-          PYTHONPATH=src pytest
+          pip install tox tox-gh-actions
+      - name: Run all tests with tox
+        run: tox

pyproject.toml

@@ -30,6 +30,7 @@ dev = [
     "flake8~=3.8.4",
     "twine~=4.0.2",
     "build~=0.10.0",
+    "tox~=4.4.7"
 ]
 test = [
     "pytest>=6.2.5",

tox.ini

@@ -1,13 +1,38 @@
 [tox]
-env_list =
-    py{37,38,39,310,311}
+env_list = lint, format, type, py{37,38,39,310,311}
 minversion = 4.4.7
 
 [testenv]
 description = run the tests with pytest
 package = wheel
 wheel_build_env = .pkg
-deps =
-    pytest>=6.2.5
-commands =
-    pytest {tty:--color=yes} {posargs}
+deps = pytest>=6.2.5
+commands = pytest {tty:--color=yes} {posargs}
+
+[testenv:lint]
+description = run flake8
+skip_install = true
+basepython = python3.11
+deps = flake8~=3.8.4
+commands = flake8 {posargs:src/pyprojroot tests}
+
+[testenv:format]
+description = run black
+basepython = python3.11
+deps = black~=19.3b0
+skip_install = true
+commands = black --check --diff src/pyprojroot tests
+
+[testenv:type]
+description = run type checks
+basepython = python3.11
+deps = mypy~=0.720
+commands = mypy --strict {posargs:src/pyprojroot}
+
+[gh-actions]
+python =
+    3.7: py37
+    3.8: py38
+    3.9: py39
+    3.10: py310
+    3.11: py311, lint, format, type