minitest provides a complete suite of testing facilities supporting TDD, BDD, and benchmarking. "I had a class with Jim Weirich on testing last week and we were allowed to choose our testing frameworks. Kirk Haines and I were paired up and we cracked open the code for a few test ...

RuboCop's Node and NodePattern classes.

Interactive Ruby command-line tool for REPL (Read Eval Print Loop).

Generate equivalent source for parser gem AST nodes

RBS is the language for type signatures for Ruby and standard library definitions.

i18n-tasks helps you find and manage missing and unused translations. It analyses code statically for key usages, such as `I18n.t('some.key')`, in order to report keys that are missing or unused, pre-fill missing keys (optionally from Google Translate), and remove unused keys.

RubyCritic is a tool that wraps around various static analysis gems to provide a quality report of your Ruby code.

IDE tools for code completion, inline documentation, and static analysis

An opinionated language server for Ruby

Sets package level boundaries between a specified set of ruby constants to minimize cross-boundary referencing and dependency.

Flay analyzes code for structural similarities. Differences in literal values, variable, class, method names, whitespace, programming style, braces vs do/end, etc are all ignored. Making this totally rad.

RSpec::Parameterized supports simple parameterized test syntax in rspec.

Flog reports the most tortured code in an easy to read pain report. The higher the score, the more pain the code is in.

Useful tools for Sorbet enthusiasts.

TypeProf performs a type analysis of non-annotated Ruby code. It abstractly executes input Ruby code in a level of types instead of values, gathers what types are passed to and returned by methods, and prints the analysis result in RBS format, a standard type description format for Ruby 3.0.

RBI generation framework

ruby2ruby provides a means of generating pure ruby code easily from RubyParser compatible Sexps. This makes making dynamic language processors in ruby easier than ever!

Analyze code for potentially uncalled / dead methods, now with auto-removal.

Embed Crystal code directly in Ruby.

A RBS files generator for Rails application