Code Coverage Annotation

Reviewing test coverage information for a whole repository can be overwhelming and hard to take action on. It's much more useful to catch gaps in coverage as they're introduced to a repo, right in the context of pull requests!

All processing is done within Github Actions, no data is sent to an external server.

Sample PR Annotation

Inputs

Key	Required	Default	Description
GITHUB_TOKEN	yes	-	Github Token generated by Github Action workflow. You can pass this in as ${{secrets.GITHUB_TOKEN}}
COVERAGE_FILE_PATH	yes	-	Location of coverage file that was generated
COVERAGE_FORMAT	no	lcov	Format of coverage file. May be lcov, clover, or go
DEBUG	no	-	Log debugging information. Comma-separated list of possible values coverage, pr_lines_added

Usage

Add the action to your workflow file like so, replacing the file path and coverage format with values appropriate for your repo:

- name: Code Coverage Annotation
  uses: ggilder/codecoverage@v1
  with:
    GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
    COVERAGE_FILE_PATH: "./coverage/lcov.info"
    COVERAGE_FORMAT: "lcov"

Golang Workflow Example

- name: Run tests with coverage
  run: go test -v ./... -coverprofile coverage.out

- name: Code Coverage Annotation
  uses: ggilder/codecoverage@v1
  with:
    GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
    COVERAGE_FILE_PATH: coverage.out
    COVERAGE_FORMAT: go

Javascript/Typescript

Set up npm run test:cov in your package.json scripts to run jest --coverage, which will output Lcov formatted information to coverage/lcov.info.

Other languages

• Java/Groovy can use Clover format
• PHPUnit will output Clover with the --coverage-clover flag
• C++: GCC Gcov can output Lcov format; this blog post may help you get started.
• Ruby: Simplecov can output Lcov format when you add the simplecov-lcov gem to your Gemfile. Make sure to set SimpleCov::Formatter::LcovFormatter.config.report_with_single_file to true and provide the path to the output file using COVERAGE_FILE_PATH as described above.

Contributing

First, you'll need to have a reasonably modern version of node handy, ideally 16 or newer. Older versions will change the format of package-lock.json.

Install the dependencies:

$ npm install

Run formatting and linting, build the typescript and package it for distribution, and run tests:

$ npm run all

Make sure you commit the dist/ folder or CI will fail.

Validate

You can validate the action while developing by referencing ./ in a workflow in your repo (see test.yml)

uses: ./
with:
  GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
  COVERAGE_FILE_PATH: "./coverage/lcov.info"

Acknowledgements

This project was originally based on https://github.com/shravan097/codecoverage (which is unmaintained).