add tests and CI workflow

.github/workflows/test.yml

@@ -0,0 +1,25 @@
+name: test
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      max-parallel: 4
+      matrix:
+        python-version: [2.7, 3.7]
+        os: [ubuntu-latest, windows-latest]
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+      - name: Test
+        run: pytest -v -n auto --cov=my_first_calculator --cov-fail-under 69 tests.py

.gitignore

@@ -45,3 +45,11 @@ $RECYCLE.BIN/
 Network Trash Folder
 Temporary Items
 .apdisk
+
+# Coverage
+.coverage
+htmlcov
+
+# Environment
+.venv
+.env

requirements.txt

@@ -0,0 +1,3 @@
+pytest
+pytest-cov
+pytest-xdist