在 docker 容器中本地执行 WDIO-Test 会引发错误：@wdio/cli:utils: A service failed in the 'onPrepare' hook

问题描述

我在 docker 容器中本地执行无头 e2e 测试，如下所示：

docker-compose up
yarn test

我在开始时收到此错误消息：

ERROR @wdio/cli:utils: A service Failed in the 'onPrepare' hook
TypeError: Cannot read property 'args' of undefined
    at DockerLauncher.onPrepare (C:\myProgs\myWdioTest\node_modules\wdio-docker-service\lib\launcher.js:30:9)
    at C:\myWdioTest\myWdioTest\node_modules\@wdio\cli\build\utils.js:24:40
    at Array.map (<anonymous>)
    at Object.runServiceHook (C:\myProgs\myWdioTest\node_modules\@wdio\cli\build\utils.js:21:33)
    at Launcher.run (C:\myProgs\myWdioTest\node_modules\@wdio\cli\build\launcher.js:61:27)
    at processticksAndRejections (internal/process/task_queues.js:95:5)

我没有使用 onPrepare-Hook wdio-configuration-file（见下文）。

测试每次都继续进行并实际上成功完成，就像它应该的那样。在这一点上，简单地抑制此错误消息对我来说是一个可行的解决方案（因为此错误不会影响测试结果）。

存在用于在 saucelabs 上运行的测试的解决方案 here，但这对我不起作用。但这让我怀疑是否必须在我的 docker-compose-file 中寻找解决方案：

version: "3"
services:
  chrome:
    image: selenium/node-chrome:4.0.0-rc-1-prerelease-20210713
    shm_size: 2gb
    depends_on:
      - selenium-hub
    environment:
      - SE_EVENT_BUS_HOST=selenium-hub
      - SE_EVENT_BUS_PUBLISH_PORT=4442
      - SE_EVENT_BUS_SUBSCRIBE_PORT=4443
    ports:
      - "6900:5900"

  selenium-hub:
    image: selenium/hub:4.0.0-rc-1-prerelease-20210713
    container_name: selenium-hub
    ports:
      - "4442:4442"
      - "4443:4443"
      - "4444:4444"

这是我的 wdio-configuration-file 的内容：

import browserOptions from "./browserOpts";
import CucumberOptions from "./cucumberOpts";

const fs = require('fs');
const wdioParallel = require('wdio-cucumber-parallel-execution');
const reporter = require('cucumber-html-reporter');
const currentTime = new Date().toJSON().replace(/:/g,"-");
const jsonTmpDirectory = `reports/json/tmp/`;

let featureFilePath = `featureFiles/*.feature`;
let timeout = 30000;

exports.config = {
    hostname: 'localhost',port: 4444,sync: true,specs: [
        featureFilePath
    ],maxInstances: 1,capabilities: [{
        maxInstances: 1,browserName: "chrome",'goog:chromeOptions': browserOptions.getChromeOpts(),}],logLevel: 'error',bail: 0,baseUrl: 'http://localhost',waitforTimeout: timeout,connectionRetryTimeout: timeout * 3,connectionRetryCount: 3,services: ['docker'],framework: 'cucumber',reporters: [
        ['cucumberjs-json',{
            jsonFolder: jsonTmpDirectory,language: 'de'
        }]
    ],cucumberOpts: CucumberOptions.getDefaultSettings(),before: function (capabilities,specs) {
        browser._setwindowSize(1024,768)
    },beforeSuite: function (suite) {
        console.log(`Suite "${suite.fullTitle}" from file "${suite.file}" starts`);
    },beforeTest: function (test) {
        console.log(`Test "${test.title}" starts`);
    },afterTest: function (test) {
        console.log(`Test "${test.title}" finished`);
    },onComplete: () => {
        console.log('<<< E2E-TEST COMPLETED >>>\n\n');

        try {
            let consolidatedJsonArray = wdioParallel.getConsolidatedData({
                parallelExecutionReportDirectory: jsonTmpDirectory
            });

            let jsonFile = `${jsonTmpDirectory}report.json`;
            fs.writeFileSync(jsonFile,JSON.stringify(consolidatedJsonArray));

            let options = {
                theme: 'bootstrap',jsonFile: jsonFile,output: `reports/html/report-${currentTime}.html`,reportSuiteAsScenarios: true,scenarioTimestamp: true,launchReport: true,ignoreBadJsonFile: true
            };

            reporter.generate(options);
        } catch (err) {
            console.log('err',err);
        }
    }
};

解决方法

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