Add Actions workflow

.github/workflows/test.yml

@@ -0,0 +1,27 @@
+name: Python Tests
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest
+        pip install pytest-mock
+        pip install -r requirements.txt
+
+    - name: Run tests
+      run: |
+        pytest tests/test_send.py