javascript – 如何模拟第三方React Native NativeModules？

2019年7月21日 247次阅读

组件正在导入包含本机模块的库.这是一个人为的例子：

import React from 'react';
import { View } from 'react-native';
import { Answers } from 'react-native-fabric';

export default function MyTouchComponent({ params }) {
  return <View onPress={() => { Answers.logContentView() }} />
}

以下是来自react-native-fabric的Answers的相关部分：

var { NativeModules, Platform } = require('react-native');
var SMXAnswers = NativeModules.SMXAnswers;

在mocha测试中导入此组件时,如果未定义SMXAnswers,则会失败：

你如何模拟SMXAnswers或react-native-fabric,以便它不会破坏并允许你测试你的组件？

p.s.：你可以看到full setup和component我试图在GitHub上测试.

最佳答案 使用mockery来模拟任何本机模块,如下所示：

import mockery from 'mockery';

mockery.enable();
mockery.warnOnUnregistered(false);
mockery.registerMock('react-native-fabric', {
  Crashlytics: {
    crash: () => {},
  },
});

这是一个完整的setup example：

import 'core-js/fn/object/values';
import 'react-native-mock/mock';

import mockery from 'mockery';
import fs from 'fs';
import path from 'path';
import register from 'babel-core/register';

mockery.enable();
mockery.warnOnUnregistered(false);
mockery.registerMock('react-native-fabric', {
  Crashlytics: {
    crash: () => {},
  },
});

const modulesToCompile = [
  'react-native',
].map((moduleName) => new RegExp(`/node_modules/${moduleName}`));

const rcPath = path.join(__dirname, '..', '.babelrc');
const source = fs.readFileSync(rcPath).toString();
const config = JSON.parse(source);

config.ignore = function(filename) {
  if (!(/\/node_modules\//).test(filename)) {
    return false;
  } else {
    const matches = modulesToCompile.filter((regex) => regex.test(filename));
    const shouldIgnore = matches.length === 0;
    return shouldIgnore;
  }
}

register(config);
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