测试vuejs prop default，即jest中的匿名函数

// MyComponent.vue
<template>
  <div>{{ propValue }}</div>
</template>

<script>
export default {
  props: {
    propValue: {
      type: Function,
      default: () => {
        return () => {
          console.log('Default function called');
        };
      },
    },
  },
};
</script>

// MyComponent.spec.js
import { mount } from '@vue/test-utils';
import MyComponent from './MyComponent.vue';

describe('MyComponent', () => {
  it('should call the default function when prop is not provided', () => {
    const wrapper = mount(MyComponent);
    const defaultFunction = wrapper.props().propValue;

    // 调用匿名函数
    defaultFunction();

    // 检查是否输出了 'Default function called'
    expect(console.log).toHaveBeenCalledWith('Default function called');
  });
});