JavaScript test coverage leaderboard report generator, inspired by the [ci-game]( Jenkins plugin.
Switch branches/tags
Nothing to show
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.


JavaScript test coverage leaderboard report generator, inspired by the ci-game Jenkins plugin.

cov-rank is a command-line tool for generating a JavaScript unit test coverage leaderboard report by walking through the Git history of a target repository, tracking unit test coverage by commit, and rewarding authors who increase coverage with points.

Inspired by the ci-game Jenkins plugin.


  1. For each commit, generate the repo's test coverage report
    • If the commit increases coverage, increase the author's points
    • If the commit decreases coverage, decrease the the author's points
  2. Generate a JSON file with leaderboard information, sorted by an author's rank, including test coverage change events by that author.

Point Values

  • Point values are based on total unit test statement coverage percentage.
  • 1% === 100 points, e.g., a commit that raises overall test statement coverage by 1% will reward the author with 100 points
  • Commits that break unit tests will not affect an author's score
  • All authors start at 0 points

Getting Started

  1. Install globally with npm:

    npm install cov-rank --global
  2. Generate a test coverage leaderboard report

    cov-rank --repo=../target/repo --report=./cov-rank.json


All of the following command-line options are optional.


Show version and exit.


Default: '.'

Path to the target repository. The target repository must:

  • Exist on the local filesystem, and not be bare
  • Include runnable tests (by the --repo-test-command) that generates a JSON test coverage summary. (See --repo-cov-summary.)


Default: 'npm tst'

Test command to run within the repo. The test must generate a coverage summary report. See --repo-cov-summary.


Default: './coverage/coverage-summary.json'

Path to the test coverage summary JSON file, generated by --repo-test-command, in the form:

    "/code/foo/bar.js": {
        "statements":   { "total": 4, "covered": 4, "skipped": 0, "pct": 100 },

Coverage tools such as istanbul and gulp-istanbul will generate a report summary in this form using the json-summary reporter.


Default: './coverage/coverage-rank.json'

Path to the coverage leaderboard JSON report file.

  • If the report file does not exist, a new one will be created
  • If the report file does exist, it will be updated, starting from the lastCommit.

The report will take the following form:

    "lastCommit": {
        "sha":  "6443870b2799bb84c8aff6b0ed38802c36616dda",
        "date": "2014-12-23 15:53:54 -0800"
    "authors": [
            "author": "Homer Simpson",
            "totalScore": 453,
            "changeLog": [
                    "sha": "13824901d09a13438c23d012ea51cc87683002c1",
                    "date": "2014-12-23 15:09:22 -0800",
                    "score": 50

Tip: If you want to completely re-create the report instead of updating it, simply delete it, and it will be re-created from scratch.

--file-filter (Not yet implemented)

Default: null

Only include commits that touch files matching the --file-filter, e.g., '*.js'


MIT. See LICENSE file.