vue-test-utils安装程序获取TypeError:无法在字符串上创建属性“_Ctor”

Question

我一直在跟踪本指南和本指南，用vue-test-utils和vue 2在Rails 5.1上用webpacker安装jest测试。我能够在没有vue组件的情况下运行基本测试，但是尝试挂载vue组件会导致错误：

   TypeError: Cannot create property '_Ctor' on string 'PostAddress'

       7 |
       8 |   it('mounts', () => {
    >  9 |     let wrapper = shallow('PostAddress');
      10 |
      11 |     expect(1 + 1).toBe(2);
      12 |   });

      at Function.Vue.extend (node_modules/vue/dist/vue.runtime.common.js:4785:67)
      at createConstructor (node_modules/@vue/test-utils/dist/vue-test-utils.js:4562:25)
      at mount (node_modules/@vue/test-utils/dist/vue-test-utils.js:4654:12)
      at shallow (node_modules/@vue/test-utils/dist/vue-test-utils.js:4691:10)
      at Object.<anonymous> (spec/javascript/PostAddress.spec.js:9:19)

我的测试文件PostAddress.test.js看起来像：

import { mount } from '@vue/test-utils'  // mounts with children
import { shallow } from '@vue/test-utils' // mounts without children

import PostAddress from 'packs/components/PostAddress.vue';


describe('PostAddress', () => {
  it('mounts', () => {
    let wrapper = shallow('PostAddress');

    expect(1 + 1).toBe(2);
  });
});

package.json的相关部分

  "devDependencies": {
    "@vue/test-utils": "^1.0.0-beta.12",
    "babel-jest": "^23.0.0-alpha.0",
    "babel-preset-es2015": "^6.24.1",
    "jest": "^22.4.2",
    "vue-jest": "^2.2.1",
    "webpack-dev-server": "2.11.2"
  },
  "jest": {
    "roots": [
      "spec/javascript"
    ],
    "moduleDirectories": [
      "node_modules",
      "app/javascript"
    ],
    "transform": {
      "^.+\\.js$": "<rootDir>/node_modules/babel-jest",
      ".*\\.(vue)$": "<rootDir>/node_modules/vue-jest"
    },
  }

该组件本身在浏览器中工作得很好(而且非常简单)。Jest在添加expect(1 + 1).toBe(2);语句并试图挂载/淡化组件之前，正在处理一个简单的let断言。

还有什么我需要的吗？第一次使用很多这些工具，所以谢谢你的指点！

Answer 1

浅层使用组件对象作为第一个参数，而不是字符串名称。

因此，改变：

let wrapper = shallow('PostAddress');

转入：

let wrapper = shallow(PostAddress);

来自官方文档的参考：https://vue-test-utils.vuejs.org/en/api/shallow.html

shallow(component {, options}]) 参数：

• {Component}组件
• {Object}选项