javascript - 如何在 Jest 测试中模拟 StatusBarManager.getHeight？

Question

我正在使用 expo 34 和 react-native-ui-lib来自 wix，在为我的组件设置 Jest 测试时遇到问题。问题看起来出现在 link 中Wix 库的

function setStatusBarHeight() {
  statusBarHeight = isIOS ? 20 : StatusBarManager.HEIGHT;
  if (isIOS) {
    // override guesstimate height with the actual height from StatusBarManager
    StatusBarManager.getHeight(data => (statusBarHeight = data.height));
  }
}

TypeError: StatusBarManager.getHeight 不是函数

TypeError: StatusBarManager.getHeight is not a function If I simply change it and return 42 my test can run.

有什么方法可对于Jest地模拟 StatusBarManager.getHeight 吗？

我尝试在我的根文件夹中创建 jest-setup.js

import { NativeModules } from 'react-native';

NativeModules.StatusBarManager = {getHeight: jest.fn()};

// mock native modules
jest.mock('@react-native-community/blur', () => {});

但是没有用。我当前的 jest.config.js

module.exports = {
    preset: "jest-expo",
    moduleFileExtensions: ['js','jsx','json', 'ts', 'tsx'],
    transform: {
      "^.+\\.(js|jsx|ts|tsx)$": "babel-jest"
    },
    testMatch: [
      "**/*.test.ts?(x)"
    ],
  }

Answer 1

我能够用这段代码解决这个问题

import React from 'react'
import 'react-native'
import { NativeModules } from 'react-native' // !this module
import renderer from 'react-test-renderer'
import Description from './Description'

// and this mock
NativeModules.StatusBarManager = {getHeight: jest.fn()}

describe('TextArea test', () => {
  it('Empty TextArea with title', () => {
    const description = renderer.create(
    <Description {...{