add istanbul

Author: huangshuwei

babel.config.js

@@ -4,7 +4,8 @@ module.exports = {
     /* presets: [["env", { modules: false }]], */
     env: {
         test: {
-            presets: [["env", { targets: { node: "current" } }]]
+            presets: [["env", { targets: { node: "current" } }]],
+            plugins: ["istanbul"]
         }
     }
 };

package.json

@@ -13,7 +13,7 @@
     "libs"
   ],
   "scripts": {
-    "test": "cross-env NODE_ENV=test jest --config jest.config.js",
+    "test": "cross-env NODE_ENV=test BABEL_ENV=test jest --config jest.config.js",
     "test:cover": "cross-env NODE_ENV=test COVERAGE=true jest --config jest.config.js",
     "codecov": "codecov",
     "lint": "vue-cli-service lint",