pytest github action

.github/workflows/pytest.yml

@@ -0,0 +1,30 @@
+name: Python package
+
+on:
+    push:
+        branches: [ main ]
+    pull_request:
+        branches: [ main ]
+
+jobs:
+    build:
+
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                python-version: [3.7, 3.8, 3.9]
+
+        steps:
+        - uses: actions/checkout@v2
+        - name: Set up Python ${{ matrix.python-version }}
+            uses: actions/setup-python@v2
+            with:
+                python-version: ${{ matrix.python-version }}
+        - name: Install dependencies
+            run: |
+                python -m pip install --upgrade pip
+                pip install .
+                pip install pytest
+        - name: Test with pytest
+            run: |
+                pytest