Add GitHub's test workflow

Author: jeylau

.github/workflows/test_package.yml

@@ -0,0 +1,33 @@
+name: Test suite
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: true
+      matrix:
+        os: [ubuntu-latest, macos-11, windows-latest]
+        python-version: [3.9]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - 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 pytest
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+
+      - name: Run pytest tests
+        run: |
+          pytest