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+# Addressing Flaky GTests
+
+## Understanding builder results
+
+The [Flake portal](https://analysis.chromium.org/p/chromium/flake-portal/flakes)
+links to the flake occurrences of various tests on various bots. On the flake
+occurrences page for a specific test, clicking on any of the timestamps takes
+you to the bot run that flaked.
+
+![flake_portal_occurrences]
+
+You can then search the page for the flaky test name to view
+details on how it failed. The failure will either be in a unittest run or
+browsertest run. Note that the flake may either be detected as a flaky failure
+if it passed on a following run (a "cq hidden flake" on the flake portal), or it
+could have flaked multiple times causing the bot run to fail (a "cq false
+rejection" on the flake portal). The build step output provides a link to your
+test output. If your flaky test has both hidden flakes and false rejections,
+take a look at the output for both as they may provide different hints toward
+the issue.
+
+![flaky_build_step]
+
+Compare the flake output to the expected output when the test passes. Sometimes
+observing the output is enough to narrow down the issue. However, sometimes
+there’s very little output or it’s not that useful, such as when the test times
+out. In this case you can try and add more logging and reproduce the flake.
+
+## Reproducing the flaky test
+
+If debugging via bot is too slow or you otherwise need to drill further into the
+cause of the flake, you can try to reproduce the flake locally. Reproducing the
+flake can be difficult, so it can help to try and replicate the test environment
+as closely as possible.
+
+Copy the gn args from one of the bots where the flake occurs, and try to choose
+a bot close to your system, i.e. linux-rel if you're building on linux. To get
+the gn args, you can again click on the timestamp in the flake portal to view
+the bot run details, and search for the "lookup GN args" build step to copy the
+args.
+
+![bot_gn_args]
+
+Build and run the test locally. Depending on the frequency of the flake, it may
+take some time to reproduce. Some helpful flags:
+ - --gtest_repeat=100
+ - --gtest_also_run_disabled_tests (if the flaky test(s) you're looking at have
+been disabled)
+
+If you're unable to reproduce the flake locally, you can also try uploading your
+patch with the debug logging and flaky test enabled to try running the bot to
+reproduce the flake with more information.
+
+>TODO: Add more tips for reproducing flaky tests
+
+## Debugging the flaky test
+
+If the test is flakily timing out, consider any asynchronous code that may cause
+race conditions, where the test subject may early exit and miss a callback, or
+return faster than the test can start waiting for it (i.e. make sure event
+listeners are spawned before invoking the event).
+
+For browsertest flakes, consider possible inter-process issues, such as the
+renderer taking too long or returning something unexpected.
+
+>TODO: Add more tips for common flake causes
+
+## Preventing similar flakes
+
+Once you understand the problem and have a fix for the test, think about how the
+fix may apply to other tests, or if documentation can be improved either in the
+relevant code or this flaky test documentation.
+
+
+[flake_portal_occurrences]: images/flake_portal_occurrences.png
+[flaky_build_step]: images/flaky_build_step.png
+[bot_gn_args]: images/bot_gn_args.png
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