added workflow

.github/workflows/tests.yml

@@ -0,0 +1,33 @@
+name: unit tests
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-20.04
+
+    strategy:
+      matrix:
+        python-version: [3.9.2]
+
+    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 poetry
+        poetry install --with test
+    - name: Run tests
+      run: |
+        poetry run pytest