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Use "headless" flag in web tests for LUCI - #10075
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This pull request introduces support for running web integration tests headlessly. It adds a headless parameter to the TestFlutterApp constructor and passes the --web-run-headless flag when running on Chrome if headless mode is enabled. I have reviewed the changes and have no feedback to provide.
johnpryan
approved these changes
Nov 4, 2026
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Work towards #9995
This LUCI log shows a failure for the integration tests on Linux: https://ci.chromium.org/ui/p/dart/builders/try/devtools-linux-release-x64-try/90?
The root cause is that when testing against a Flutter Web target (
DEVICE=flutter-web), DevTools launches a fixture test app using flutterrun --machine -d chrome --no-devtools, without the--web-run-headlessflag. On LUCI Linuxbots (Ubuntu 24.04 Noble running headlessly without
$DISPLAY), Chrome aborts immediately on launch because unprivileged user namespaces are restricted by AppArmor and--no-sandboxwas not supplied.Because
--web-run-headlesswas omitted:flutter_toolsattempted to start Chrome in GUI mode with sandboxing enabled.SWARMING_BOT_ID: luci-dart-try-noble-..., Ubuntu 24.04,SWARMING_HEADLESS: 1, no$DISPLAY), AppArmor blocks unprivileged user namespaces.