pytest in ci

.github/workflows/pytest.yml

@@ -0,0 +1,32 @@
+name: ci
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  tox:
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        os: [windows-latest, ubuntu-latest]
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Cache multiple paths
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/pip
+            $RUNNER_TOOL_CACHE/Python/*
+            ~\AppData\Local\pip\Cache
+          key: ${{ runner.os }}-build-${{ matrix.python-version }}
+      - name: install-reqs
+        run: python -m pip install --upgrade tox virtualenv setuptools pip -r requirements-dev.txt
+      - name: Run pytest
+        run: pytest tests --cov=narwhals --cov=tests