A CLI tool and GitHub Action to post Go code coverage reports as comment to your pull requests.
go-coverage-report is a command line tool and a GitHub Action that
parses code coverage results to create a tabular code coverage report. This
markdown report is intended as pull request comment both to highlight the
impact of the changes on the code coverage on all updated packages and to
motivate the contributors to write tests for their code.
The provided tool and GitHub Action work without any third-party services which makes them fast, secure and very easy-to-setup in your own CI/CD pipeline.
Example of a pull request comment created by go-coverage-report:
Please note that by default, the "Coverage by file" section is collapsed so the focus is more on the overall impact on the coverage per package.
There is no indicator of the total coverage of the project because the impact by changed package is typically a better indicator of the quality of the changes. Additionally, looking at coverage changes by package is more motivating as code coverage improvements are more pronounced (i.e. typically larger percentage values) when zooming into the package level, instead of comparing changes on the project level.
The last column is an emoji "score" that is based on the coverage change of the package. The following emojis are used:
- 🌟 - The coverage of the package increased by > 20%
- 🎉 - The coverage of the package increased by <= 20%
- 👍 - The coverage of the package increased by <= 10%
- 👎 - The coverage of the package decreased by <= 10%
- 💀 - The coverage of the package decreased by > 10%, every 10% add another skull (up to five skulls)
The go-coverage-report tool ships with a GitHub Action that you can easily
include in your own Workflows:
name: CI
# This setup assumes that you run the unit tests with code coverage in the same
# workflow that will also print the coverage report as comment to the pull request.
# Therefore, you need to trigger this workflow when a pull request is (re)opened or
# when new code is pushed to the branch of the pull request. In addition, you also
# need to trigger this workflow when new code is pushed to the main branch because
# we need to upload the code coverage results as artifact for the main branch as
# well since it will be the baseline code coverage.
#
# We do not want to trigger the workflow for pushes to *any* branch because this
# would trigger our jobs twice on pull requests (once from "push" event and once
# from "pull_request->synchronize")
on:
pull_request:
types: [opened, reopened, synchronize]
push:
branches:
- 'main'
jobs:
unit_tests:
name: "Unit tests"
runs-on: ubuntu-latest
steps:
- name: Checkout repository
uses: actions/checkout@v4
- name: Setup Go
uses: actions/setup-go@v4
with:
go-version: ^1.22
# When you execute your unit tests, make sure to use the "-coverprofile" flag to write a
# coverage profile to a file. You will need the name of the file (e.g. "coverage.txt")
# in the next step as well as the next job.
- name: Test
run: go test -cover -coverprofile=coverage.txt ./...
- name: Archive code coverage results
uses: actions/upload-artifact@v4
with:
name: code-coverage
path: coverage.txt # Make sure to use the same file name you chose for the "-coverprofile" in the "Test" step
code_coverage:
name: "Code coverage report"
if: github.event_name == 'pull_request' # Do not run when workflow is triggered by push to main branch
runs-on: ubuntu-latest
needs: unit_tests # Depends on the artifact uploaded by the "unit_tests" job
steps:
- uses: fgrosse/[email protected] # Consider using a Git revision for maximum security
with:
coverage-artifact-name: "code-coverage" # can be omitted if you used this default value
coverage-file-name: "coverage.txt" # can be omitted if you used this default valueinputs:
version:
description: 'The exact version of the go-coverage-report tool to use.'
required: true
default: "v1.0.1"
sha256sum:
description: 'Optional SHA256 checksum of the tarball when downloading the go-coverage-report binary.'
required: false
coverage-artifact-name:
description: 'The name of the artifact containing the code coverage results.'
required: true
default: "code-coverage"
coverage-file-name:
description: 'The name of the file containing the code coverage results.'
required: true
default: "coverage.txt"
root-package:
description: |
The Go import path of the tested repository to add as a prefix to all paths of the
changed files. This is useful to map the changed files (e.g., ["foo/my_file.go"]
to their coverage profile which uses the full package name to identify the files
(e.g., "github.com/fgrosse/example/foo/my_file.go"). Note that currently,
packages with a different name than their directory are not supported.
required: false
default: "github.com/${{ github.repository }}"
trim:
description: Trim a prefix in the "Impacted Packages" column of the markdown report.
required: falseThis action does not provide any outputs, but it will comment on your pull request with the summary of the code coverage changes.
- Currently, code coverage profiles are uploaded as GitHub artifacts which automatically expire after 90 days. In a repository which receives changes only infrequently, this might lead to issues when trying to compare the code coverage of a pull request with the code coverage of the main branch (see #5).
- Packages with a name that differs from their directory on disk are not supported yet.
- tj-actions/changed-files - A GitHub Action to get the list of changed files in pull requests
- pkg/errors - Simple error handling primitives
- testify - A simple unit test library
- and more
Please read CONTRIBUTING.md for details on our code of conduct and on the process for submitting pull requests to this repository.
We use SemVer for versioning. All significant (e.g. breaking) changes are documented in the CHANGELOG.md. A list of all available versions can be found at the releases page.
-
Friedrich Große - Initial work - fgrosse
-
See also the list of contributors who participated in this project.
This project is licensed under the BSD-3-Clause License - see the LICENSE file for details.
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