Revert "test: ignore jest due to there is no elegant way to test tele…

…port"

This reverts commit d1257e2.

.github/workflows/ci.yml

@@ -23,4 +23,11 @@ jobs:
 
       - run: yarn test:cypress
 
-      # TODO: https://github.com/vuejs/vue-test-utils-next/issues/418
+      - run: yarn test:jest --coverage
+        env:
+          CI: true
+
+      - name: Upload coverage to Coveralls
+        uses: coverallsapp/github-action@v1.1.1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

package.json

@@ -32,8 +32,9 @@
   "scripts": {
     "build": "rollup --config",
     "dev": "rollup --config --watch --environment DEVELOPMENT",
-    "test": "yarn test:cypress",
+    "test": "yarn test:jest && yarn test:cypress",
     "test:cypress": "yarn cypress run",
+    "test:jest": "jest --clearCache && jest test/**/*",
     "release": "standard-version",
     "lint": "prettier --check *",
     "postinstall": "husky install",