ci: add GH workflow for testing and coverage in PR

Author: ekalinin

.github/workflows/tests.yml

@@ -0,0 +1,67 @@
+name: Tests
+
+on:
+  pull_request:
+    branches:
+      - master
+      - main
+  push:
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements-dev.txt
+
+      - name: Run tests with tox
+        run: |
+          tox -e py$(echo ${{ matrix.python-version }} | tr -d '.')
+
+      - name: Run flake8
+        run: |
+          flake8 --extend-ignore=E127 nodeenv.py tests setup.py
+
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python 3.14
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.14'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements-dev.txt
+
+      - name: Run tests with coverage
+        run: |
+          coverage run -p -m pytest
+          coverage report -m
+          coverage html
+
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-report
+          path: coverage-html/
+