ci: add run test job

.github/workflows/test.yml

@@ -0,0 +1,31 @@
+name: Run tests
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - '**.py'
+  pull_request:
+    branches:
+      - master
+    paths:
+      - '**.py'
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        python: ['3.6', '3.7', '3.8']
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python }}
+      - name: Install poetry
+        run: curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python
+      - name: Install libraries
+        run: poetry install
+      - name: Run all tests
+        run: python -m unittest -v tests/*.py