我正在尝试在排毒测试中模拟RNCamera。但是，模拟摄像机不会覆盖实际的实现。

我遵循了these instructions，并加入了建议from these posts。

结果是：

• 模拟摄像机类文件本身 已执行（打印了顶层日志）
• 模拟相机的takePictureAsync和渲染功能不称为
• 使用仿真器的默认摄像头

我也尝试过：

• RN_SRC_EXT=e2e react-native run-android，然后detox test
• 在最佳身体中添加"test-runner": "jest" and calling jest.mock`
• 用RN_SRC_EXT=e2e代替RN_SRC_EXT=e2e.js
• 清理：rm -rf node_modules; yarn install等

我的应用布局就像（不包含与测试无关的内容）

package.json：

{
  ...
  "dependencies": {
    ...
    "@types/jest": "^24.0.21","react": "16.9.0","react-dom": "latest","react-native": "0.61.1","react-native-camera": "^3.6.0",},"devDependencies": {
    "@babel/core": "latest","@babel/preset-env": "latest","@babel/register": "latest","@babel/preset-react": "latest","@react-native-community/eslint-config": "^0.0.5","babel-jest": "^24.9.0","detox": "^14.5.1","jest": "^24.9.0","jest-fetch-mock": "^2.1.2","metro-react-native-babel-preset": "^0.56.0","mocha": "^6.2.2","react-test-renderer": "16.9.0"
  },"detox": {
    "configurations": {
      "android.emu.debug": {
        "binaryPath": "android/app/build/outputs/apk/debug/app-debug.apk","build": "RN_SRC_EXT=e2e cd android && ./gradlew assembleDebug assembleAndroidTest -DtestBuildType=debug && cd ..","type": "android.emulator","device": {
          "avdName": "Pixel_2_API_29"
        }
      },"android.emu.release": {
        "binaryPath": "android/app/build/outputs/apk/release/app-release.apk","build": "RN_SRC_EXT=e2e cd android && ./gradlew assembleRelease assembleAndroidTest -DtestBuildType=release && cd ..","device": {
          "avdName": "Pixel_2_API_29"
        }
      }
    }
  }
}

e2e/config.js：

require('@babel/register')({
    //cache: true,presets: [require('metro-react-native-babel-preset')],plugins: [require('@babel/plugin-transform-runtime').default],only: ['./e2e','./js'],ignore: ['node_modules']
  });

e2e/config.json：

{
    "setupFilesAfterEnv": ["./init.js"],"testEnvironment": "node","reporters": ["detox/runners/jest/streamlineReporter"],"testMatch": ["**/__tests__/**/*.js?(x)","**/?(*.)(e2e).js?(x)"],"verbose": true
}

e2e/mocha.opts：

--recursive
--timeout 300000
--bail
--file e2e/init.js
--require e2e/config.js
--require e2e/config.json
--file e2e/react-native-camera.e2e.js

metro.config.js：

const defaultsourceExts = require('metro-config/src/defaults/defaults').sourceExts
module.exports = {
    transformer: {
        getTransformOptions: async () => ({
            transform: {
                experimentalImportSupport: false,inlineRequires: false,}),resolver: { 
        sourceExts: process.env.RN_SRC_EXT
                    ? process.env.RN_SRC_EXT.split(',').concat(defaultsourceExts)
                    : defaultsourceExts
      }
};
// printed as: module.exports.resolver from e2e { sourceExts: [ 'e2e','js','json','ts','tsx' ] }
console.log("module.exports from e2e",module.exports);

e2e/config.json：

{
    "setupFilesAfterEnv": ["./init.js"],// tried with and without this line
    "testMatch": ["**/__tests__/**/*.js?(x)","verbose": true
}

test.spec.js

describe('Example',() => {
  beforeEach(async () => {
      await device.reloadReactNative();
  });

  it('should blah blah balh',async () => {
      // test implementation
  });
 });

init.js：

const detox = require('detox');
const config = require('../package.json').detox;
const adapter = require('detox/runners/mocha/adapter');

before(async () => {
    await detox.init(config);
});

beforeEach(async function() {
    await adapter.beforeEach(this);
});

afterEach(async function() {
    await adapter.afterEach(this);
});

after(async () => {
    await detox.cleanup();
});

e2e/react-native-camera.e2e.js ：（来自here）

import React from 'react';

const timeout = ms => new Promise(resolve => setTimeout(resolve,ms));

// This IS printed on detox test -c android.emu.debug.
console.log("executing react-native-camera-e2e.js");
export class RNCamera extends React.Component {
  static Constants = {
    Aspect: {},BarCodeType: {},Type: { back: 'back',front: 'front' },CaptureMode: {},Capturetarget: {},CaptureQuality: {},Orientation: {},flashMode: {},TorchMode: {},};

  takePictureAsync = async () => {
    console.log("mock RNCamera takePictureAsync"); // Never printed
    await timeout(2000);
    return {  uri: './static-image.jpg'  };
  };

  render() {
   // This is never printed.
    console.log("mock RNCamera render()");
    return null;
  }
}

export const takePictureAsync = async () => {
  console.log("mock RNCamera takePictureAsync"); // never printed
  await timeout(2000);
  return { uri: './static-image.jpg' };
};


export default RNCamera;