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https://github.com/mbj/mutant

Automated code reviews via mutation testing - semantic code coverage.
https://github.com/mbj/mutant

code-quality-analyzer code-review coverage dynamic-analysis minitest mutant mutation-testing rspec ruby static-analysis static-anaysis uncovered-semantics

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Automated code reviews via mutation testing - semantic code coverage.

Lists

README 

        
mutant

======



![Build Status](https://github.com/mbj/mutant/workflows/CI/badge.svg)

[![Gem Version](https://img.shields.io/gem/v/mutant.svg)](https://rubygems.org/gems/mutant)

[![Discord](https://img.shields.io/discord/767914934016802818.svg)](https://discord.gg/BSr62b4RkV)



## What is Mutant?



An automated code review tool, with a side effect of producing semantic code coverage

metrics.



Think of mutant as an expert developer that simplifies your code while making sure that all tests pass.



That developer never has a bad day and is always ready to jump on your PR.



Each reported simplification signifies either:



A) A piece of code that does more than the tests ask for.

   You can probably use the simplified version of the code. OR:



B) If you have a reason to not take the simplified version as it violates a requirement:

   There was no test that proves the extra requirement. Likely you are missing an

   important test for that requirement.



On extensive mutant use A) happens more often than B), which leads to overall less code enter

your repository at higher confidence for both the author and the reviewer.



BTW: Mutant is a mutation testing tool, which is a form of code coverage.

But each reported uncovered mutation is actually a call to action, just like a flag in a code review

would be.



## Getting started:



* Start with reading the [nomenclature](/docs/nomenclature.md). No way around that one, sorry.

* Then select and setup your [integration](/docs/nomenclature.md#integration), also make sure

  you can reproduce the examples in the integration specific documentation.

* Use mutant during code reviews and on CI in [incremental](/docs/incremental.md) mode.

* Do not merge code with new alive mutations. If you really must bypass:

  Add the subjects with open problems to the ignored subjects.



## Operating Systems



Mutant is supported and tested under Linux and Mac OS X.



## Ruby Versions



Mutant supports multiple ruby versions at different levels:



* Runtime, indicates mutant can execute on a specific Ruby Version / implementation.

* Syntax, depends on Runtime support, and indicates syntax new to that Ruby version can be used.

* Mutations, depends on Syntax support, and indicates syntax new to that Ruby version is being analysed.



Supported indicates if a specific Ruby version / Implementation is actively supported. Which means:



* New releases will only be done if all tests pass on supported Ruby versions / implementations.

* New features will be available.



| Implementation | Version        | Runtime            | Syntax             | Mutations          | Supported          |

| -------------- | -------------- | -------            | ------------------ | ------------------ | ------------------ |

| cRUBY/MRI      | 3.0            | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |

| cRUBY/MRI      | 3.1            | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |

| cRUBY/MRI      | 3.2            | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |

| cRUBY/MRI      | 3.3            | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |

| jruby          | TBD            | :email:            | :email:            | :email:            | :email:            |

| mruby          | TBD            | :email:            | :email:            | :email:            | :email:            |

| cRUBY/MRI      | < 3.0          | :no_entry:         | :no_entry:         | :no_entry:         | :no_entry:         |



Labels:



* :heavy_check_mark: Supported.

* :warning: Experimental Support.

* :soon: Active work in progress.

* :email: Planned, please contact me on interest.

* :no_entry: Not being planned, or considered, still contact me on interest.



## Licensing



Mutant is commercial software, with a free usage option for opensource projects.

Opensource projects have to be on a public repository.



Commercial projects have to pay a monthly or annual subscription fee.



## Opensource usage



Usage is free and does not require a signup. But it requires the code is under an

opensource license and public. Specify `--usage opensource` on the CLI or `usage: opensource`

in the config file.



## Commercial usage



Commercial use requires payment via a subscription and requires a signup. See [pricing](#pricing) for

available plans.



After payment pecify `--usage commercial` on the CLI or `usage: commercial` in the config file.



### Pricing



**Mutant is free for [opensource use](#opensource-usage)!**



For commercial use mutants pricing is subscription based.



| Currency | Duration | Cost    | Payment Methods                                       |

| -------- | -------  | ------- | ----------------------------------------------------- |

| USD      | 1 month  | 90$     | Credit Card                                           |

| USD      | 1 year   | 900$    | Credit Card, ACH transfer                             |

| EUR      | 1 month  | 90€     | Credit Card, SEPA Direct Debit                        |

| EUR      | 1 year   | 900€    | Credit Card, SEPA Direct Debit, SEPA Transfer         |



Costs are **per developer using mutant on any number of repositories**.



Volume subscriptions with custom plans are available on request.



Should you want to procure a commercial mutant subscription please

[mail me](mailto:[email protected]?subject=Mutant%20Commercial%20License) to start the payment

process.



Please include the following information:



* Your business invoice address.

* A payment email address, if different from your email address.

* Only for the EU: A valid VAT-ID is *required*, no sales to private customers to avoid the

  horrors cross border VAT / MOSS.

  VAT for EU customers outside of Malta will use **reverse charging**.



Also feel free to ask any other question I forgot to proactively answer here.



Also checkout the [commercial FAQ](/docs/commercial.md).



## Topics



* [Commercial use / private repositories](/docs/commercial.md)

* [Nomenclature](/docs/nomenclature.md)

* [Reading Reports](/docs/reading-reports.md)

* [Limitations](/docs/limitations.md)

* [Concurrency](/docs/concurrency.md)

* [Rspec Integration](/docs/mutant-rspec.md)

* [Minitest Integration](/docs/mutant-minitest.md)

* [Configuration](/docs/configuration.md)

* [Sorbet](/docs/sorbet.md)



## Communication



Try the following:



* [Discord Channel](https://discord.gg/BSr62b4RkV) reach for `@mbj`.

* [Github Issues](https://github.com/mbj/mutant/issues)

* [Release Announcement Mailing List](https://announce.mutant.dev/signup)



## Sponsoring



Mutant, as published in the opensource version, would not exist without the help

of [contributors](https://github.com/mbj/mutant/graphs/contributors) spending lots

of their private time.



Additionally, the following features where sponsored by organizations:



* The `mutant-minitest` integration was sponsored by [Arkency](https://arkency.com/)

* Mutant's initial concurrency support was sponsored by an undisclosed company that does

  currently not wish to be listed here.



### Legal



Contents of this repository are maintained by:



```

Schirp DSO LTD

Director: Markus Schirp

Email: [email protected]

Vat-ID: MT24186727

Registration: C80467



Office address:

2, Carob Lane,

Sir Harry Luke Street

Naxxar NXR 2209,

Malta



Registred Address

Phoenix Business Centre,

The Penthouse,

Old Railway Track,

Santa Venera SVR9022,

Malta

```