build: CI coverage

Author: giladgd

.github/workflows/test.yml

@@ -15,4 +15,11 @@ jobs:
       - name: TypeScript validity
         run: npm run test:typescript
       - name: Coverage
-        run: npx c8 mocha
+        run: npx c8 --reporter cobertura --reporter text mocha
+      - name: Upload coverage
+        uses: codecov/codecov-action@v2
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./coverage/cobertura-coverage.xml
+          flags: unittests
+          fail_ci_if_error: true