The mime-types library provides a library and registry for information about Multipurpose Internet Mail Extensions (MIME) content type definitions. It can be used to determine defined filename extensions for MIME types, or to use filename extensions to look up the likely MIME type definitions.

Bundler automatically downloads and installs a list of gems specified in a "Gemfile", as well as their dependencies.

Rspec-mocks provides RSpec's "test double" framework, with support for stubbing and mocking.

RSpec is a behavior-driven development (BDD) framework for Ruby. This meta-package includes the RSpec test runner, along with the expectations and mocks frameworks.

minitest-focus gives the ability focus on a few tests with ease without having to use command-line arguments. It introduces a focus class method for use in testing classes, specifying that the next defined test is to be run.

Rake-compiler provides a framework for building and packaging native C and Java extensions in Ruby.

Hoe is a rake/rubygems helper for project Rakefiles. It helps manage, maintain, and release projects and includes a dynamic plug-in system allowing for easy extensibility. Hoe ships with plug-ins for all the usual project tasks including rdoc generation, testing, packaging, deployment, and announcement.

Rspec-expectations provides a simple API to express expected outcomes of a code example.

Rspec-mocks provides RSpec's "test double" framework, with support for stubbing and mocking.

This package is a wrapper around parallel_tests that runs every test in a fork to avoid pollution and get clean output per test.

Mustache is a framework-agnostic way to render logic-free views. Think of Mustache as a replacement for your views. Instead of views consisting of ERB or HAML with random helpers and arbitrary logic, your views are broken into two parts: a Ruby class and an HTML template.

These Ruby bindings are not intended to be directly used, but rather used by higher level bindings like those provided by CZTop.

Systemu can be used on any platform to return status, stdout, and stderr of any command. Unlike other methods like open3 and popen4 there is no danger of full pipes or threading issues hanging your process or subprocess.

RSpec::Its provides the its method as a short-hand to specify the expected value of an attribute. For example, one can use its(:size)\should eq(1)\.

The x25519 gem is an efficient public key cryptography library for Ruby providing key exchange/agreement via the X25519 (as known as Curve25519) Elliptic Curve Diffie-Hellman function as described in RFC 7748.

This package provides a module for encoding and decoding (X)HTML entities.

This package provides a implementations of custom cops that are bundled as defaults in Standard Ruby.

This package provides actionable code coverage reports for Ruby projects. It has very little overhead and can be easily integrated with development tools to catch coverage problems early.

This package provides a plugin for the RuboCop code style enforcing & linting tool.

Notiffany is a Ruby wrapper library for notification libraries such as Libnotify.

Net::HTTP::Persistent manages persistent HTTP connections using Net::HTTP, supporting reconnection and retry according to RFC 2616.

The binding_of_caller module provides the Binding#of_caller method. It allows accessing bindings from upper frames in the call stack and can evaluate code in that context.

Reline is a pure Ruby alternative GNU Readline or Editline implementation.

ExecJS lets you run JavaScript code from Ruby. It automatically picks a runtime to evaluate your JavaScript program, then returns the result to you as a Ruby object.