feat: add unit testing workflow

Author: mdhishaamakhtar

.github/workflows/tests.yml

@@ -0,0 +1,53 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+    # Remove the line above to run when pushing to master
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    services:
+      postgres:
+        image: postgres:11
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: postgres
+        ports: [ '5432:5432' ]
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.9
+
+      - uses: actions/cache@v1
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -r requirements.txt
+        if: steps.cache.outputs.cache-hit != 'true'
+
+      - name: Test with black
+        run: |
+          python -m black --check .
+      - name: Test with pytest
+        env:
+          DATABASE_URL: 'postgresql://postgres:postgres@localhost:${{ job.services.postgres.ports[5432] }}/postgres'
+        run: |
+          python -m pytest