vant/src/badge/test/index.spec.js

import Badge from '..';
import { mount } from '@vue/test-utils';

test('should render nothing when content is empty string', () => {
  const wrapper = mount(Badge, {
    props: {
      content: '',
    },
  });

  expect(wrapper.html()).toMatchSnapshot();
});

test('should render nothing when content is undefined', () => {
  const wrapper = mount(Badge, {
    props: {
      content: undefined,
    },
  });

  expect(wrapper.html()).toMatchSnapshot();
});

test('should render nothing when content is zero', () => {
  const wrapper = mount(Badge, {
    props: {
      content: 0,
    },
  });

  expect(wrapper.html()).toMatchSnapshot();
});

test('should render content slot correctly', () => {
  const wrapper = mount(Badge, {
    slots: {
      content: () => 'Custom Content',
    },
  });

  expect(wrapper.html()).toMatchSnapshot();
});

test('should change dot position when using offset prop', () => {
  const wrapper = mount(Badge, {
    props: {
      dot: true,
      offset: [2, 4],
    },
    slots: {
      default: () => 'Child',
    },
  });

  const badge = wrapper.find('.van-badge').element;
  expect(badge.style.top).toEqual('4px');
  expect(badge.style.right).toEqual('-2px');
});

test('should change dot position when using offset prop without children', () => {
  const wrapper = mount(Badge, {
    props: {
      dot: true,
      offset: [2, 4],
    },
  });

  const badge = wrapper.find('.van-badge').element;
  expect(badge.style.marginTop).toEqual('4px');
  expect(badge.style.marginLeft).toEqual('2px');
});