如何禁用Playwright测试结果持久化以适配Azure Function

问题原因 #

即便已将Playwright的报告器配置为唯一的list，Playwright仍会默认启用内置的last-run报告器——它需要写入/home/site/wwwroot/test-results/.last-run.json来记录上次测试运行状态。但Azure Function的/home/site/wwwroot目录属于只读文件系统，因此触发了EROFS错误。

解决方案 #

方案1：完全禁用last-run报告（推荐） #

在playwright.config.ts中添加lastRun: false配置项，彻底关闭这个自动启用的报告器，避免任何文件写入操作：

import { defineConfig } from '@playwright/test';

export default defineConfig({
  reporter: [['list']],
  lastRun: false, // 禁用last-run报告器
  // 其他原有配置...
});

方案2：指定可写入的临时目录（可选） #

如果需要保留last-run功能，可将测试结果目录指向Azure Function的临时可写目录/tmp，该目录在函数运行期间支持读写：

import { defineConfig } from '@playwright/test';

export default defineConfig({
  reporter: [['list']],
  testResultsDir: '/tmp/test-results', // 切换到临时可写目录
  // 其他原有配置...
});

错误信息参考 #

{"success":false,"message":"Failed to run Playwright tests","error":"Command failed: node ./node_modules/@playwright/test/cli.js test\nError in reporter Error: EROFS: read-only file system, open '/home/site/wwwroot/test-results/.last-run.json'\n    at async open (node:internal/fs/promises:641:25)\n    at async Object.writeFile (node:internal/fs/promises:1215:14)\n    at async LastRunReporter.onEnd (/home/site/wwwroot/node_modules/playwright/lib/runner/lastRun.js:71:5)\n    at async wrapAsync (/home/site/wwwroot/node_modules/playwright/lib/reporters/multiplexer.js:89:12)\n    at async Multiplexer.onEnd (/home/site/wwwroot/node_modules/playwright/lib/reporters/multiplexer.js:57:25)\n    at async InternalReporter.onEnd (/home/site/wwwroot/node_modules/playwright/lib/reporters/internalReporter.js:77:12)\n    at async finishTaskRun (/home/site/wwwroot/node_modules/playwright/lib/runner/tasks.js:94:26)\n    at async runTasks (/home/site/wwwroot/node_modules/playwright/lib/runner/tasks.js:81:10)\n    at async runAllTestsWithConfig (/home/site/wwwroot/node_modules/playwright/lib/runner/testRunner.js:379:18)\n    at async runTests (/home/site/wwwroot/node_modules/playwright/lib/program.js:242:18) {\n  errno: -30,\n  code: 'EROFS',\n  syscall: 'open',\n  path: '/home/site/wwwroot/test-results/.last-run.json'\n}\n","output":"\nError: EROFS: read-only file system, rmdir '/home/site/wwwroot/test-results'\n\n\n","errors":"Error in reporter Error: EROFS: read-only file system, open '/home/site/wwwroot/test-results/.last-run.json'\n    at async open (node:internal/fs/promises:641:25)\n    at async Object.writeFile (node:internal/fs/promises:1215:14)\n    at async LastRunReporter.onEnd (/home/site/wwwroot/node_modules/playwright/lib/runner/lastRun.js:71:5)\n    at async wrapAsync (/home/site/wwwroot/node_modules/playwright/lib/reporters/multiplexer.js:89:12)\n    at async Multiplexer.onEnd (/home/site/wwwroot/node_modules/playwright/lib/reporters/multiplexer.js:57:25)\n    at async InternalReporter.onEnd (/home/site/wwwroot/node_modules/playwright/lib/reporters/internalReporter.js:77:12)\n    at async finishTaskRun (/home/site/wwwroot/node_modules/playwright/lib/runner/tasks.js:94:26)\n    at async runTasks (/home/site/wwwroot/node_modules/playwright/lib/runner/tasks.js:81:10)\n    at async runAllTestsWithConfig (/home/site/wwwroot/node_modules/playwright/lib/runner/testRunner.js:379:18)\n    at async runTests (/home/site/wwwroot/node_modules/playwright/lib/program.js:242:18) {\n  errno: -30,\n  code: 'EROFS',\n  syscall: 'open',\n  path: '/home/site/wwwroot/test-results/.last-run.json'\n}\n"}

内容的提问来源于stack exchange，提问作者Gregory Suvalian