TypeError：无法读取 null 的属性'类型” - 使用异步函数测试 vue 组件

Question

我正在测试组件 ComponentA.spec.js，但收到 TypeError: Cannot read property 'type' of null。如果我去掉 ComponentA 中 getData() 函数中的 wait 关键字，它就会起作用。我在测试中模拟了 getData api 调用，但它仍然不起作用。

这是完整的堆栈 类型错误：C：[隐私]\未知：无法读取 null 的属性“类型”

at assert (node_modules/@babel/types/lib/asserts/generated/index.js:284:112)
at Object.assertIdentifier (node_modules/@babel/types/lib/asserts/generated/index.js:373:3)
at new CatchEntry (node_modules/regenerator-transform/lib/leap.js:93:5)
at Emitter.Ep.explodeStatement (node_modules/regenerator-transform/lib/emit.js:535:36)
at node_modules/regenerator-transform/lib/emit.js:323:12
    at Array.forEach (<anonymous>)
at Emitter.Ep.explodeStatement (node_modules/regenerator-transform/lib/emit.js:322:22)
at Emitter.Ep.explode (node_modules/regenerator-transform/lib/emit.js:280:40)

这是我正在尝试为其创建测试的组件 A

<template>
  <div class="d-flex flex-row">
    <component-b />
    <component-c />
  </div>
</template>

<script>
import ComponentB from './ComponentB';
import ComponentC from './ComponentC';
import { getData } from 'apis';
export default {
  name: 'component-a',
  components: {
    ComponentB,
    ComponentC,
  },
  async created() {
    await this.getData();
  },
  methods: {
    // This function is the culprit
    async getData() {
      try {
        const response = await getData();
      } catch {
        //
      }
    },
  },
};
</script>

这是我的 ComponentA.spec.js 文件

import Vuetify from 'vuetify';
import ComponentA from 'components/ComponentA';
import { createLocalVue, shallowMount, mount } from '@vue/test-utils';

jest.mock('shared/apis', () => {
  const data = require('../fixedData/data.json');

  return {
    getData: jest.fn().mockResolvedValue(data),
  };
});

const localVue = createLocalVue();
let vuetify;

function createShallowWrapper(options = {}) {
  return shallowMount(ComponentA, {
    localVue,
    vuetify,
    ...options,
  });
}

beforeEach(() => {
  vuetify = new Vuetify();
});

describe('ComponentA', () => {
  describe('component creation', () => {
    test('testing', () => {
      const wrapper = createShallowWrapper();
      expect(wrapper).toMatchSnapshot();
    });
  });
});

Answer 1

将异常变量 (e) 添加到 ComponentA 中 getData 函数中的捕获中修复了该问题。