Rspec Expectations

screenshot of Rspec Expectations

Rspec Expectations

Provides a readable API to express expected outcomes of a code example


RSpec Expectations is a testing framework that allows users to express expected outcomes on an object in an example. It is commonly used with tools like RSpec, Test::Unit, Minitest, or Cucumber for testing Ruby applications.


  • Built-in matchers: Equivalence, Identity comparisons, Regular expressions, Truthiness, Expecting errors, Expecting throws, Yielding, etc.
  • Compound Matcher Expressions: Create compound matcher expressions using and or or.
  • Composing Matchers: Many built-in matchers take matchers as arguments for flexible specifications.


To install RSpec Expectations with RSpec:

gem install rspec

To use with other tools like Test::Unit, Minitest, or Cucumber, you can install it directly:

gem install rspec-expectations

To run against the main branch and include dependent RSpec repos, add the following to your Gemfile:

gem 'rspec-expectations'


RSpec Expectations simplifies testing scenarios in Ruby applications by providing a range of built-in matchers, compound matcher expressions, and the flexibility to compose matchers. Additionally, the installation process for using RSpec Expectations with different testing tools is straightforward, making it a versatile and user-friendly testing framework for Ruby developers.