使用Jest测试vue-echarts组件时出错

Question

当使用“vue-echarts”时，我对组件测试有问题。

InfoBoard.spec.ts

import { render } from '@testing-library/vue'

import InfoBoard from '@/components/InfoBoard.vue'

describe('InfoBoard', () => {
  test('Should be truthy', () => {
    const wrapper = render(InfoBoard, {
      stubs: {
        'v-charts': true
      },
    })
    expect(wrapper).toBeTruthy()
  })
})

InfoBoard.vue

<template>
  <div>
    <v-chart></v-chart>
  </div>
</template>

<script>
import { defineComponent } from '@nuxtjs/composition-api'
import VChart from 'vue-echarts'

export default defineComponent({
  components: {
    VChart
  },
  setup() {}
})
</script>

jest.config.js

module.exports = {
  moduleNameMapper: {
    '^@/(.*)$': '<rootDir>/$1',
    '^~/(.*)$': '<rootDir>/$1',
    '^vue$': 'vue/dist/vue.common.js'
  },
  moduleFileExtensions: [
    'ts',
    'js',
    'vue',
    'json'
  ],
  transform: {
    "^.+\\.ts$": "ts-jest",
    '^.+\\.js$': 'babel-jest',
    '.*\\.(vue)$': 'vue-jest'
  },
  collectCoverage: true,
  collectCoverageFrom: [
    '<rootDir>/components/**/*.vue',
    '<rootDir>/pages/**/*.vue'
  ],
  transformIgnorePatterns: [
    "<rootDir>/node_modules/(?!echarts)",
    "<rootDir>/node_modules/(?!echarts\/core)",
    "<rootDir>/node_modules/(?!vue-echarts)"
  ],
  testEnvironment: 'jsdom',
  setupFilesAfterEnv: ["./jest-setup.js"]
}

有错误：

 FAIL  components/InfoBoard.spec.ts
  ● Test suite failed to run

    Jest encountered an unexpected token

    Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.

    Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.

    By default "node_modules" folder is ignored by transformers.

    Here's what you can do:
     • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it.
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/configuration
    For information about custom transformations, see:
    https://jestjs.io/docs/code-transformation

    Details:

    /Users/admin/Documents/THIP/node_modules/echarts/core.js:20
    export * from './lib/export/core';
    ^^^^^^

    SyntaxError: Unexpected token 'export'

      at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1479:14)
      at Object.<anonymous> (node_modules/vue-echarts/dist/index.cjs.min.js:1:179)

我认为问题在于“转换in”，也许我写错了模式。

我搜索了很多天，我尝试了很多类似于改变'testEnviroment‘或者在.babelrc中添加插件的程序，但是没有找到解决方案。

Answer 1

我遇到了同样的问题，通过将下面的设置添加到我的jest.config.js中，使它能够正常工作

module.exports = {
  transformIgnorePatterns: ["/node_modules/(?!(echarts|zrender)/)"],
}

如果您按照这里提供的方式编写了配置，我假设您不必将根目录包含在忽略模式中。当有一个以上的忽略模式时，它也不起作用；但这可能是因为我编写忽略模式的方式。