Add GitHub Actions workflow

.github/workflows/test.yml

@@ -0,0 +1,72 @@
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - "v*.*.*"
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version:
+          - 3.8
+          - 3.9
+
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v2
+
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+          architecture: x64
+
+      - name: Install Python dependencies
+        run: |
+          pip install '.[test]'
+
+      - name: Unit tests
+        run: |
+          pytest -v tests
+
+  static-analysis:
+    name: Static analysis
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version:
+          - 3.8
+          - 3.9
+
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v2
+
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+          architecture: x64
+
+      - name: Install Python dependencies
+        run: |
+          pip install '.[test]'
+
+      - name: Check by black
+        run: |
+          black --check src tests
+
+      - name: Check by isort
+        run: |
+          isort **/*.py --check-only
+
+      - name: Check by flake8
+        run: |
+          flake8 src tests