MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.

mock-server
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java-client
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simplecov-ruby /simplecov

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

ruby
test-coverage
code-quality
rails

thoughtbot /shoulda-matchers

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Simple one-liner tests for common Rails functionality

grosser /parallel_tests

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Ruby: 2 CPUs = 2x Testing Speed for RSpec, Test::Unit and Cucumber

travisjeffery /timecop

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A gem providing "time travel", "time freezing", and "time acceleration" capabilities, making it simple to test time-dependent code. It provides a unified method to mock Time.now, Date.today, and DateTime.now in a single call.

rails
ruby
time
test

minitest /minitest

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minitest provides a complete suite of testing facilities supporting TDD, BDD, and benchmarking.

ruby
test
testing
minitest

DatabaseCleaner /database_cleaner

Ruby3K486

Strategies for cleaning databases in Ruby. Can be used to ensure a clean state for testing.

testing
ruby
database-cleaner
testing-tools

splitrb /split

Ruby2.7K369

:chart_with_upwards_trend: The Rack Based A/B testing framework

split
redis
ab-testing
ruby

mbj /mutant

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Mutation testing for Ruby. AI writes your code. AI writes your tests. But who tests the tests?

mutation-testing
ruby
coverage
rspec

test-prof /test-prof

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Ruby Tests Profiling Toolbox

tilo /smarter_csv

Ruby1.6K186

Fastest end-to-end CSV ingestion for Ruby (with C acceleration). SmarterCSV auto-detects formats, applies smart defaults, and returns Rails-ready hashes for seamless use with ActiveRecord, Sidekiq, parallel jobs, and S3 pipelines — even for messy user-uploaded real-world data.