Firefox code coverage diff viewer

This project is code coverage changeset viewer for Firefox.

The scope of this project is minimal as it will focus on:

You can view the app in here.

The app will show recent changesets from mozilla-central that have code coverage (pending changesets will be automatically be fetched). From there you can navigate to the diff of each changeset and see the code coverage for added lines. It is very important to reiterate that it is code coverage for added lines and not for a specific file (as most code coverage viewers focus on).

The data used in this UI is based on data submitted to codecov.io.

Planning and views

This is document tracks the original plans while these track grid view of plans and long term plans. You view all coverage collection work tracked in here. You can preview this app here while over here we track files without any coverage.

Disclaimers

• Linux64 only
  • partial debug build type: some flags are disabled
  • debug only tests are run
• A few tests are disabled on coverage builds due to high failures
  • Skipped tests if running a coverage job and few others
• We ignore C++ files generated from IDL, IPDL, WebIDL
• Coverage collections are for .c*, .h*, and .js* files
  • However, not all of these are covered (either no coverage or zero coverage)
  • Some of these are because we don't cover all platforms
• Intermittent failures during testing cause different code paths to be hit (such as crash reporting)
• Broken builds/failures might prevent us from running a test, set of tests, or a few jobs, coverage could be abnormally low

Filing issues

You can file frontend issues in Firefox code coverage frontend. For backend issues file them in releng-services with the 4.app: shipit_uplift label.

Requirements

• Node.js
• Yarn Package Manager

Set up

Checkout the code and run:

yarn install
yarn start