fix(CI): Update CI to add unittests to Github Action

.github/workflows/ci.yaml

@@ -4,10 +4,33 @@ on: [push, pull_request]
 permissions: write-all
 
 jobs:
+  test:
+    name: Unit tests
+
+    runs-on: macos-latest
+    strategy:
+      matrix:
+        python-version: [3.7]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: install python dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install -r dev-requirements.txt
+      - name: run tests
+        run: python -m pytest tests/
 
   deploy:
     name: Deploy to GitHub and PyPI
     runs-on: macos-latest
+    needs: test
     if: github.ref == 'refs/heads/main' && github.repository_owner == 'ph-tools'
     steps:
       - uses: actions/checkout@v2