Add code coverage step

Author: tarunbatra

.github/workflows/main.yml

@@ -6,9 +6,9 @@ name: CI
 # events but only for the master branch
 on:
   push:
-    branches: [ master ]
+    branches: [master]
   pull_request:
-    branches: [ master ]
+    branches: [master]
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
@@ -19,22 +19,31 @@ jobs:
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
-    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-    - uses: actions/checkout@v2
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
 
-    - name: Set up Python
-      uses: actions/setup-python@v2
-      with:
-        python-version: '3.x'
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.x"
 
-    - name: Install global dependencies
-      run: python -m pip install -U pip setuptools wheel
+      - name: Install global dependencies
+        run: python -m pip install -U pip setuptools wheel
 
-    - name: Install deps
-      run: pip install -r requirements.txt
+      - name: Install deps
+        run: pip install -r requirements.txt
 
-    - name: Install password_validator
-      run: pip install .
+      - name: Install dev deps
+        run: pip install -r requirements-dev.txt
 
-    - name: Run tests
-      run: python -m unittest discover tests -v
+      - name: Install password_validator
+        run: pip install .
+
+      - name: Run tests
+        run: coverage run --source src -m unittest discover -s tests -v
+
+      - name: Generate coverage report
+        run: coverage report
+
+      - name: Upload coverage report to Codecov
+        uses: codecov/codecov-action@v1