QA/Platform/DOM/Metrics

This page documents the various metrics QA uses to assess the quality of Firefox/Gecko's DOM implementation from version to version. The purpose of these metrics is to help us make informed decisions about testing strategy. These metrics serve several needs, including but not limited to:

• identifying areas of risk for testing before we release a new version of Firefox
• informing root cause analysis discussions when something inevitably slips through the cracks
• measuring the trends in product quality over the long-term
• measuring competitiveness and spec compliance

Please contact Anthony Hughes if you have any questions or feedback regarding this initiative. He can usually be found in #qa on irc.mozilla.org between 09:00 and 17:00 (UTC-9/-10) Monday to Friday by mentioning the nickname ashughes.

Phase I: Establishing a Baseline

The goal of the initial phase is to establish a baseline that all future quality can be measured against.

In implementation we will experiment with a lot of different metrics and data sources in an attempt to see which metrics, either singularly or in conjunction with other data, enable us to effectively make informed decisions.

Catalog of Potential Data Sources and Metrics

Draft proof of concepts can be found in my Google Drive

• https://github.com/AutomatedTester/futurama-data
  • intermittent test failure rate
  • backout rate
• http://brasstacks.mozilla.com/testreports/weekly
  • tests enabled week over week
  • tests disabled week over week
  • tests skipped week over week
• https://bugzilla.mozilla.org
  • crash bugs over time (draft)
  • intermittent failure bugs by age (draft)
  • intermittent failure bugs by number of comments (draft)
  • intermittent failure bugs by sub-component (draft)
  • intermittent failure bugs in/out (draft)
  • regression bugs by age (draft)
  • regression bugs by number of comments (draft)
  • regression bugs in/out (draft)
  • regression bugs by sub-component (draft)
  • bugs with in-testsuite coverage (draft)
  • tracked bugs by version (draft)
  • unconfirmed bugs by sub-component (draft)
  • bugs by platform (draft)
  • mean time to find regression window [ask klahnakoski about elastic search db]
  • mean time to resolve a bug with a regression window vs a regression without a window [ask klahnakoski about elastic search db]
• to be determined
  • spec test coverage
  • http://www.tjhsst.edu/~jcranmer/m-ccov/
  • https://treeherder.mozilla.org/#/jobs?repo=mozilla-central
  • https://scitools.com/ for code complexity analysis, possibly other metrics