在 docker 容器中本地执行 WDIO-Test 会引发错误：@wdio/cli：utils：服务在"onPrepare"挂钩中失败

Question

我正在docker容器中本地执行一个无头e2e测试，如下所示：

docker-compose up
yarn test

我一开始就收到这个错误消息：

ERROR @wdio/cli:utils: A service failed in the 'onPrepare' hook
TypeError: Cannot read property 'args' of undefined
at DockerLauncher.onPrepare (C:myProgsmyWDIOTestnode_moduleswdio-docker-serviceliblauncher.js:30:9)
at C:[e-mail]:24:40
at Array.map (<anonymous>)
at Object.runServiceHook (C:[e-mail]:21:33)
at Launcher.run (C:[e-mail]:61:27)
at processTicksAndRejections (internal/process/task_queues.js:95:5)

我没有使用onPrepare Hook的wdio配置文件(见下文(。

测试继续进行，实际上每次都会成功完成，就像它应该完成的那样。在这一点上，简单地抑制这个错误消息对我来说是一个可行的解决方案(因为这个错误不会影响测试结果(。

这里有一个在炖锅实验室上运行测试的解决方案，但这对我来说不起作用。但这让我怀疑是否必须在我的docker撰写文件中寻找解决方案：

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配置文件的内容：

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 >>>nn');
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);
}
}
};

Answer 1

如果从wdio.conf.js中删除services: ['docker'],，则docker-compose.yml应与Webdriverio一起使用。

根据本视频中的一条评论，如果您希望wdio实例化它自己的容器，则需要services: ['docker']。

Answer 2

要消除此错误消息，请为wdio docker指定单独的配置文件，并将服务保留为空数组-对我来说，这是有效的，wdio知道它应该在容器上运行测试，希望它能帮助

services: [],