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https://github.com/simplecov-ruby/simplecov

Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites
https://github.com/simplecov-ruby/simplecov

Keywords

code-quality coverage coverage-library coverage-report rails ruby test-coverage

Keywords from Contributors

activerecord activejob mvc rubygems rspec rubocop code-formatter static-code-analysis rack sinatra

Last synced: about 12 hours ago
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Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites

README.md

SimpleCov Gem Version Build Status Lint Typecheck Mutation Maintainability

Code coverage for Ruby

SimpleCov is a code coverage analysis tool for Ruby. It uses Ruby's built-in
Coverage library to gather coverage data, but makes processing the
results much easier by providing a clean API to filter, group, merge, format,
and display them. You can get a full coverage setup running in a couple of
lines of code.

SimpleCov tracks covered Ruby code.

In most cases you'll want overall coverage results spanning all of your tests
(unit, integration, etc.). SimpleCov handles this automatically by caching and
merging results as it generates reports, so a report reflects coverage across
your whole test suite and gives you a truer picture of your blank spots.

SimpleCov bundles two formatters: the default HTML formatter (which renders the
browsable report) and a JSON formatter. Both were once separate gems
(simplecov-html and simplecov_json_formatter) but are now built into
SimpleCov and configured automatically when you launch it. A wide variety of
alternate formatters are distributed as gems.

Getting started

  1. Add SimpleCov to your Gemfile and bundle install:

    gem 'simplecov', require: false, group: :test

  2. Load and launch SimpleCov at the very top of your test helper, whether
    that's test/test_helper.rb, spec/spec_helper.rb, rails_helper.rb, or
    Cucumber's features/support/env.rb. SimpleCov doesn't care which framework
    you run. It watches what code executes and reports on it, so the same two
    lines work everywhere:

    require 'simplecov'
SimpleCov.start

# Previous content of test helper now starts here

    Important: SimpleCov.start must run before any of your
    application code is required    . Otherwise SimpleCov (and the underlying
    Coverage library) can't track those files. This bites hardest with tools
    that keep your app loaded between runs, like Spring. See the
    Spring section.

    SimpleCov must run in the process you want to analyze. When you test a
    server process (e.g. a JSON API) from a separate test process (e.g. via
    Selenium) and want to see all the code the rails server executes, not just
    the code in your test files, require SimpleCov in the server process. For
    Rails, add this near the top of bin/rails, below the shebang and after
    config/boot is required:

    if ENV['RAILS_ENV'] == 'test'
  require 'simplecov'
  SimpleCov.start 'rails'
end

  3. Run your full test suite to see your application's coverage.

  4. Open the HTML report in your default browser:

    simplecov open

    (The bundled simplecov CLI picks the right opener for your platform:
    open on macOS, xdg-open on Linux/BSD, start on Windows. Pass
    --report PATH to open a non-default location. See the
    command-line interface for the full set of subcommands.)

  5. Optionally, keep coverage results out of Git:

    echo coverage >> .gitignore

For Rails applications, SimpleCov ships a built-in rails
profile that sets up groups for your
Controllers, Models, Helpers, and Libraries:

require 'simplecov'
SimpleCov.start 'rails'

Example output

Coverage results report

SimpleCov coverage report

Source file coverage details view

SimpleCov source file detail view

Configuration at a glance

Configuration goes in your start block, or in a .simplecov file at the
project root when several test suites share it. The API is built around a
small set of consistent verbs: formatters are picked by name, thresholds
live in a per-criterion coverage block where scope is a uniform per:
argument, and misses can be capped as absolute counts rather than ratios:

SimpleCov.start do
  enable_coverage :branch            # track branches as well as lines
  cover "{app,lib}/**/*.rb"          # report on these files, even if never loaded
  skip "app/legacy"                  # ...but leave these out
  group "Models", "app/models"       # organize the report into groups

  coverage :line do
    minimum      90                  # fail the suite below 90% line coverage
    maximum_drop 1                   # ...or when coverage drops more than 1%
    maximum_missed 5, per: :file     # no file may carry more than 5 uncovered lines
  end

  coverage :branch, minimum: 80, ignore: :implicit_else
end

Everything you're using today keeps working. Legacy spellings warn and name
their replacement, and once you've migrated, deprecations :raise turns any
old spelling that creeps back in into an error. The
migration map
has the full before and after, and every option is documented in
docs/Configuration.md, including criteria, filters,
groups, profiles, and thresholds.

Tracking which test covers each line

Coverage normally tells you whether a line ran, not what ran it. track_tests
records the other half of the story:

SimpleCov.start do
  track_tests
end

RSpec examples and Minitest tests are wrapped automatically. In the HTML
report, covered lines that no test executed (they only ran at load time, or in
suite setup) drain to a distinct tint, so coverage that merely loads code
stops passing for coverage that tests it, and clicking a line's badge lists
the tests that cover it. The same recording answers from the terminal:

$ simplecov tests lib/simplecov/result.rb:42
spec/result_spec.rb:42

The output is one test id per line and nothing else, so it pipes straight into
a runner. simplecov tests --redundant inverts the question, listing the
tests whose covered lines other tests also cover, which is where a
test-pruning session starts. Recording has a real
cost, which is why it's opt-in and comes with levers to control it. See
the configuration docs.

Finding dead code in production

SimpleCov can also measure production code usage, the surest way to find
dead code. The old trick was to plant a log line in a suspect method and
watch production for a while. Oneshot coverage runs that experiment for
every line at once: a line reports its first execution and nothing after,
so a live process records what real traffic uses with the least possible
impact on performance. simplecov dead-code then crosses the recording
with the test report and turns it into insight you can act on. Code
neither tests nor traffic touch is safe to delete, and code production
runs but tests skip is the most valuable test you haven't written. The
HTML report and coverage.json include the same production data. See
docs/Production.md for more details on why and how
to set it up.

Coverage of just your change

An overall number moves slowly on a mature codebase, but "is the code in this
change tested?" has a crisp answer the day you ask it. simplecov patch reads
the git diff against a base ref and scores only the lines you touched:

$ simplecov patch --base main --minimum 100
   88.00% (22/25) lines  lib/simplecov/cli/patch.rb  missing 41-43
  100.00% (4/4) lines    lib/simplecov/result.rb
  Patch coverage:  89.66% (26/29) lines

--minimum turns it into a gate, so a project that can't lift its overall
number in one pull request can still require that everything it adds is
covered. The flip side is simplecov affected, which uses a track_tests
recording to select the tests that touch your changed code and hand them to
the runner, falling back (loudly) to the full suite whenever the map can't be
trusted:

$ simplecov affected --base main --run bundle exec rspec

Both commands are documented in the CLI docs.

Covering views

View templates execute real logic, and now they can be part of the report.
cover_views brings ERB, Haml, and Slim templates in, measured through eval
coverage:

SimpleCov.start 'rails' do
  cover_views
end

Templates are ordinary files in the report, highlighted in their own language
and grouped under Views by the rails profile, and a template no test renders
shows up at 0% instead of being quietly missing. Expect your overall number to
drop the first time you turn this on. That's the point. See
view coverage.

Per-file ratchets and coverage history

On a legacy codebase, one per-file minimum does nothing useful: set it to what
the worst file scores and every other file is allowed to sink to that level.
simplecov ratchet writes a checked-in baseline instead, giving each file its
own floor at the coverage it has already reached:

$ simplecov ratchet
simplecov ratchet: wrote .simplecov_baseline.yml (3 tightened, 1 pruned, 148 unchanged)

Floors only ever tighten, so touching a legacy file drags its coverage upward
and it can never slide back. Think .rubocop_todo.yml, applied to coverage.
To ratchet automatically at the end of every run, add the baseline formatter
with formats :html, :baseline.

Alongside the floors, every successful run now appends to
coverage/.history.json, so you have a recorded trend rather than just the
last number. simplecov history draws it as sparklines in the terminal, and
drop_baseline :median judges coverage drops against the recorded median
instead of whatever the previous run happened to score. See
the baseline and
run history docs.

More from the command line

The simplecov CLI has grown from a report opener into a toolbelt. A few
favorites:

$ simplecov watch bundle exec rspec   # re-run on save, live-reload the served report
$ simplecov show lib/foo.rb           # annotated source in the terminal
$ simplecov status                    # is this report fresh, and for which commit?
$ simplecov uncovered --missing       # worst files, with the exact line ranges to test
$ simplecov badge --output badge.svg  # a shields.io-style SVG, no badge service needed

watch deserves the highlight: with a track_tests recording in the report,
a save re-runs only the tests that touch the files you changed, which turns
the report into something you keep open while writing the test. There is also
shell tab completion (simplecov completions fish|bash|zsh), a man page, and
a real --help on every command. The full tour is in
docs/CLI.md.

Owner metadata

GitHub Events

Total
Last Year

Committers metadata

Last synced: 1 day ago

Total Commits: 2,092
Total Committers: 236
Avg Commits per committer: 8.864
Development Distribution Score (DDS): 0.645

Commits in past year: 739
Committers in past year: 26
Avg Commits per committer in past year: 28.423
Development Distribution Score (DDS) in past year: 0.143

Name Email Commits
Erik Berlin s****k@g****m 742
Christoph Olszowka c****h@o****e 392
Tobias Pfeiffer p****b@g****m 320
Akira Matsuda r****e@d****p 83
dependabot[bot] 4****] 50
David Rodríguez d****z@r****t 46
Peter H. Boling p****g@g****m 21
Cédric Félizard c****c@f****r 17
Benjamin Fleischer g****b@b****m 14
Adam Roben a****m@r****g 10
Olle Jonsson o****n@g****m 10
Xavier Shay x****r@r****t 9
Yusuke Endoh m****e@r****g 8
Jonathan Steel j****n@c****m 7
Craig Little c****l@g****m 6
Dennis Ideler i****s@g****m 6
Joseph Shraibman j****n@m****m 6
Mateusz Świszcz m****z 6
Brian Morearty b****n@m****g 5
John Thomas t****7@v****u 5
philip ritchey p****r@t****u 5
Michal Szyndel m****z@s****m 5
Alex Okolish a****h@g****m 4
Daniel Westendorf d****l@p****m 4
Hugo Peixoto h****o@g****m 4
Matijs van Zuijlen m****s@m****t 4
Nikita Afanasenko n****a@a****e 4
René Föhring rf@b****e 4
Somar.Melkhem s****m@g****m 4
Uwe Kubosch u****e@k****o 4
and 206 more...

Committer domains:

Issue and Pull Request metadata

Last synced: 1 day ago

Total issues: 217
Total pull requests: 195
Average time to close issues: about 3 years
Average time to close pull requests: 3 months
Total issue authors: 164
Total pull request authors: 60
Average comments per issue: 4.59
Average comments per pull request: 1.24
Merged pull request: 127
Bot issues: 1
Bot pull requests: 61

Past year issues: 57
Past year pull requests: 87
Past year average time to close issues: 19 days
Past year average time to close pull requests: 3 days
Past year issue authors: 26
Past year pull request authors: 18
Past year average comments per issue: 3.28
Past year average comments per pull request: 0.68
Past year merged pull request: 73
Past year bot issues: 0
Past year bot pull requests: 39

More stats: https://issues.ecosyste.ms/repositories/lookup?url=https://github.com/simplecov-ruby/simplecov

Top Issue Authors

  • sferik (14)
  • PragTob (10)
  • bkuhlmann (9)
  • G-Rath (6)
  • pboling (4)
  • keithrbennett (4)
  • visu-suganya (3)
  • hasghari (3)
  • colszowka (2)
  • cppgent0 (2)
  • andriytyurnikov (2)
  • bf4 (2)
  • maxjacobson (2)
  • ghost (2)
  • marknuzz (2)

Top Pull Request Authors

  • dependabot[bot] (61)
  • sferik (26)
  • PragTob (14)
  • pboling (6)
  • exoego (5)
  • splattael (4)
  • amatsuda (4)
  • simi (4)
  • philipritchey (4)
  • eregon (3)
  • corsonknowles (2)
  • andriytyurnikov (2)
  • chris-hewitt (2)
  • ydah (2)
  • olleolleolle (2)

Top Issue Labels

  • Docs (13)
  • Won’t fix (10)
  • Rails (9)
  • Difficulty: Easy (7)
  • Minitest (6)
  • CLI (6)
  • Breaking Change (6)
  • Support (5)
  • Bug (4)
  • Priority: Low (4)
  • Awaiting Feedback (3)
  • Has Repro Repo (3)
  • Refactoring (3)
  • Priority: High (3)
  • Branch Coverage (3)
  • Feature (2)
  • good first issue (2)
  • Coverage (2)
  • JRuby (2)
  • RSpec (1)
  • Performance (1)
  • dependencies (1)
  • github_actions (1)
  • parallel_tests (1)

Top Pull Request Labels

  • dependencies (61)
  • github_actions (55)
  • javascript (6)
  • CLI (1)
  • Rails (1)
  • Docs (1)
  • Bug (1)

Package metadata

debian-13: ruby-simplecov

  • Homepage: https://github.com/simplecov-ruby/simplecov
  • Documentation: https://packages.debian.org/trixie/ruby-simplecov
  • Licenses: mit
  • Latest release: 0.22.0-2 (published 8 months ago)
  • Last Synced: 2026-03-14T18:08:35.186Z (7 months ago)
  • Versions: 1
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gem.coop: simplecov

Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites

  • Homepage: https://github.com/simplecov-ruby/simplecov
  • Documentation: http://www.rubydoc.info/gems/simplecov/
  • Licenses: MIT
  • Latest release: 1.3.2 (published 5 days ago)
  • Last Synced: 2026-10-04T02:30:56.021Z (1 day ago)
  • Versions: 73
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  • Maintainers (7)
rubygems.org: simplecov

Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites

  • Homepage: https://github.com/simplecov-ruby/simplecov
  • Documentation: http://www.rubydoc.info/gems/simplecov/
  • Licenses: MIT
  • Latest release: 1.3.2 (published 5 days ago)
  • Last Synced: 2026-10-04T02:30:55.507Z (1 day ago)
  • Versions: 73
  • Dependent Packages: 13,481
  • Dependent Repositories: 116,805
  • Downloads: 505,715,406 Total
  • Docker Downloads: 3,394,748,336
  • Rankings:
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  • Maintainers (7)
proxy.golang.org: github.com/Simplecov-ruby/simplecov

proxy.golang.org: github.com/simplecov-ruby/simplecov

  • Homepage:
  • Documentation: https://pkg.go.dev/github.com/simplecov-ruby/simplecov#section-documentation
  • Licenses: mit
  • Latest release: v1.3.2 (published 5 days ago)
  • Last Synced: 2026-10-04T02:30:57.200Z (1 day ago)
  • Versions: 70
  • Dependent Packages: 0
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  • Rankings:
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    • Average: 5.63%
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debian-12: ruby-simplecov

  • Homepage: https://github.com/simplecov-ruby/simplecov
  • Documentation: https://packages.debian.org/bookworm/ruby-simplecov
  • Licenses: mit
  • Latest release: 0.22.0-1 (published 8 months ago)
  • Last Synced: 2026-03-13T23:47:10.305Z (7 months ago)
  • Versions: 1
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    • Average: 100%
ubuntu-24.10: ruby-simplecov

  • Homepage: https://github.com/simplecov-ruby/simplecov
  • Licenses: mit
  • Latest release: 0.22.0-1 (published 8 months ago)
  • Last Synced: 2026-09-11T00:29:12.723Z (25 days ago)
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ubuntu-23.04: ruby-simplecov

  • Homepage: https://github.com/simplecov-ruby/simplecov
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  • Latest release: 0.22.0-1 (published 8 months ago)
  • Last Synced: 2026-08-05T21:03:57.581Z (2 months ago)
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guix: ruby-simplecov

Code coverage framework for Ruby

gentoo-portage: dev-ruby/simplecov

Code coverage with a configuration library and merging across test suites

  • Homepage: https://github.com/simplecov-ruby/simplecov
  • Documentation: https://packages.gentoo.org/packages/dev-ruby/simplecov
  • Licenses: MIT
  • Latest release: 0.22.0 (published 6 months ago)
  • Last Synced: 2026-05-27T02:50:40.052Z (4 months ago)
  • Versions: 1
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  • Rankings:
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ubuntu-23.10: ruby-simplecov

  • Homepage: https://github.com/simplecov-ruby/simplecov
  • Licenses: mit
  • Latest release: 0.22.0-1 (published 8 months ago)
  • Last Synced: 2026-08-02T12:12:26.428Z (2 months ago)
  • Versions: 1
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ubuntu-24.04: ruby-simplecov

  • Homepage: https://github.com/simplecov-ruby/simplecov
  • Licenses: mit
  • Latest release: 0.22.0-1 (published 8 months ago)
  • Last Synced: 2026-03-06T16:42:25.607Z (7 months ago)
  • Versions: 1
  • Dependent Packages: 0
  • Dependent Repositories: 0
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Dependencies

Gemfile rubygems
  • apparition >= 0 development
  • aruba ~> 1.0 development
  • benchmark-ips >= 0 development
  • capybara ~> 3.31 development
  • cucumber ~> 4.0 development
  • minitest >= 0 development
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  • rake ~> 13.0 development
  • rspec ~> 3.2 development
  • rubocop >= 0 development
  • test-unit >= 0 development
  • webrick >= 0 development
  • matrix >= 0
Gemfile.lock rubygems
  • activesupport 6.1.4.4
  • addressable 2.8.0
  • apparition 0.6.0
  • aruba 1.1.2
  • ast 2.4.2
  • benchmark-ips 2.9.2
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  • capybara 3.35.3
  • childprocess 4.1.0
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simplecov.gemspec rubygems
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test_projects/monorepo/Gemfile rubygems
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test_projects/monorepo/Gemfile.lock rubygems
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test_projects/monorepo/extra/extra.gemspec rubygems
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test_projects/parallel_tests/Gemfile rubygems
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test_projects/parallel_tests/Gemfile.lock rubygems
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test_projects/rails/rspec_rails/Gemfile rubygems
  • capybara >= 3.26 development
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test_projects/rails/rspec_rails/Gemfile.lock rubygems
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Score: 36.74404620787003