R Observatory: Metrics for muttest version 0.3.0

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

muttest

0.3.0Package record

Mutation Testing

0packages dependsuggested by 1

5.9Kdownloads / year

97.3%test coverage

13/13flavors OK

Overview

About

Maintained by Jakub SobolewskiCRAN page ↗Website ↗

Measure quality of your tests. 'muttest' introduces small changes (mutations) to your code and runs your tests to check if they catch the changes. If they do, your tests are good. If not, your assertions are not specific enough. 'muttest' gives you percent score of how often your tests catch the changes.

Changes in 0.3.0

✨ New JSONMutationReporter writes a report conforming to the mutation-testing-elements schema, a cross-language standard shared by StrykerJS/.NET/Scala — so muttest output can be fed to any schema-compatible tooling.
✨ New report() renders a self-contained, source-annotated HTML report (overall score, per-file breakdown, per-line mutant diffs, status filtering, keyboard navigation) from a JSONMutationReporter file.
✨ New MultiReporter fans reporter events out to several reporters at once, e.g. a live ProgressMutationReporter alongside a JSONMutationReporter.
❗️ A mutant that makes tests *error* (rather than fail an expectation) is now scored as killed, matching PIT/Stryker/mutmut. Previously it was counted as survived.
❗️ Mutants with no test coverage (no matching test file under FileTestStrategy) are now reported as a separate no coverage category and excluded from the score, so untested code no longer looks like escaped mutants.
✨ PackageCopyStrategy gained a symlink argument. When TRUE, only the mutated file's top-level directory is copied and everything else is symlinked to the original, avoiding a full project copy per mutant (helpful for packages with large inst//data/). Defaults to FALSE; unsafe if the test suite writes into the package's own directories.
🐛 FileTestStrategy now matches test files by exact name instead of an unanchored regex, so a source file like mod.R no longer runs test-model.R and filenames with regex metacharacters are handled correctly.
🐛 Added missing digest and tools to Imports.

From NEWS.md in the release

Install

R (CRAN)Ubuntu (r2u)Fedora (COPR)openSUSE (OBS)

install.packages("muttest", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-muttest

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled. We list this channel from recorded r2u download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-muttest

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-muttest

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed). We list this channel from recorded autoCRAN download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

Health

CRAN checks

13OK

CRAN check page ↗

Slowest check: 5.9 min · r-release-macos-x86_64

Status changes

OK13 OK2026-08-05
NOTE12 OK, 1 NOTE2026-08-01
OK13 OK2026-07-03
ERROR12 OK, 1 ERROR2026-06-20
OK13 OK2026-06-09

Show 3 earlier changesHide 3 earlier changes

WARNING12 OK, 1 WARNING2026-06-08
OK14 OK2026-04-16
ERROR11 OK, 3 ERROR2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 0.3.0

READMEYes · 992 wordsVignettesYes · 5 · dynamicNEWSYes · 100% structured · mentions 0.3.0Citation fileNoWebsiteYes · pkgdown

Help pages: 40
Examples that run: 100%24 run in a plain check
Exported functions with examples: 60%
Documented parameters: 97%
Return-value docs: 68%
Help pages citing references: 0%

Vignettes (5)

How these are measured

Downloads

5.9K

CRAN downloads in the past year

Rank #8,936 · ~16/day · ~489/mo

Releases R versions

Daily download trend is not available in this view yet.

37830 days

1.1K90 days

5.9K1 year

Compare downloads with other packages →

Also on87 r2u4 autocran

How downloads are counted

Repository

jakubsob/muttest ↗Account: jakubsob

27Stars

2Forks

1Open issues

1Open PRs

6Releases

118Commits

1Commit identities

mutation-testingrtestingtesting-toolstestthat

118 commits · Last activity 2026-07-21 · +3.8% stars, 30d

Responsiveness

How these are sampled

PRs merged (all time): not measured
Median days to close, 50 most recently updated closed issues: 82
Median days to close, 50 most recently updated closed PRs: not measured

Stars over time

2026-07-22 · 262026-10-02 · 27

How these are measured

PracticesBeta

14 development-tooling and community-health practices detected across 7 families in the upstream repository

Checks run against github.com/jakubsob/muttest on 2026-10-18.

Continuous integration (2)

GitHub ActionsR CMD check workflow

The R CMD check workflow runs on Linux, macOS and Windows, and on R-devel

Governance and community (2)

Funding

Funding links: GitHub Sponsors

The repository owner accepts GitHub Sponsors

Docs source (4)

README.Rmdpkgdown

GitHub Pages site last deployed 2026-07-21 · The repository has a site deploy workflow

pkgdown site last built 2026-07-21

Coverage (1)

Coverage reporting (Codecov)

Show all practicesHide 3 practices

CRAN release process (1)

cran-comments.md

Lint, format, editor (3)

lintrLint workflowRStudio project

Git structural (1)

.gitattributes

How this is detected·Detection ruleset v3 (2026-09-26)

AI coding toolsBeta

This repository shows signs of AI coding tools.

Claude Codefirst seen 2026-05-04
Seen in the repository: CLAUDE.md
Named in .Rbuildignore: CLAUDE.md

How this is detected·Detection ruleset v4 (updated 2026-09-27)

Dependencies

Declared dependencies

23 external dependencies (excludes base and recommended)

Installing muttest adds 35 packages (21 with compiled code, 10.0 MB of source tarballs). Heaviest: fs 1.4 MB, jsonlite 1.0 MB, vctrs 1.0 MB.

Depends (1)

R >= 4.1.0

Imports (14)

checkmate cli digest fs htmltools jsonlite mirai R6 rlang testthattoolstreesitter treesitter.r withr

LinkingTo (0)

none

Suggests (10)

box covr cucumber ggplot2 jsonvalidate knitr purrr rmarkdown shiny stringr

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Suggested by 1

Suggests, most downloaded first

cucumber

How these are counted

Code & Tests

People & History

People (1)

Jakub Sobolewski

Author, Maintainer since 0.1.0 (2025)

Releases (4)

Pick two releases to compare their code metrics.

0.3.0Latest
record
2026-07-21 · current release · diff ↗ ·
added 3 exports
JSONMutationReporter, MultiReporter, report
0.2.1
record
2026-06-24 · diff ↗
0.2.0
record
2026-05-14 · diff ↗ ·
removed 1 export
plan

added 25 exports
Mutator, arithmetic_operators, boolean_literal, boolean_literals, call_name, comparison_operators, condition_mutations, delete_statement, index_decrement, index_increment, index_mutations, logical_operators, muttest_plan, na_literal, na_literals, negate_condition, numeric_decrement, numeric_increment, numeric_literals, remove_condition_negation, remove_negation, replace_return_value, string_empty, string_fill, string_literals
R
R 4.6.0 released · 2026-04-24
0.1.0
record
2025-05-30
R
R 4.5.0 released · 2025-04-11

Package metadata

First published: 2025-05-30
Total releases: 4 / 1 yrs
License: MIT + file LICENSE OSI
Minimum R: ≥ 4.1.0
Download size: 135 KB

Appears in task views

Package Development and Maintenance

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("muttest")

Format

Sobolewski, J. (2026). muttest: Mutation Testing (Version 0.3.0) [Computer software]. https://doi.org/10.32614/CRAN.package.muttest

This package has no citation file, so citation() returns this entry built from DESCRIPTION.

Cite the R Observatory

For a number measured here: a download total, a coverage figure, an archival date.

Format

APA

Balamuta, J. J. (2026). R Observatory: Metrics for muttest version 0.3.0 [Data set]. HJJB, LLC. Data release v2026-10-20. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-20, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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