Skip to content
This repository

RSpec runner and formatters

tree: bcea9dc3c6

Fetching latest commit…

Cannot retrieve the latest commit at this time


Rspec Core

Rspec is an automated testing framework for Ruby, designed for use in Behaviour Driven Development and Test Driven Development.

rspec-core includes the Rspec runner, output formatters, and the rspec command.


[sudo] gem install rspec --prerelease

This will install the rspec, rspec-core, rspec-expectations and rspec-mocks gems.

Get Started

Start with a simple example of behavior you expect from your system. Do this before you write any code:

# in spec/calculator_spec.rb
describe Calculator, "add" do
  it "returns the sum of its arguments" do, 2).should eq(3)

Run this with the rspec command, and watch it fail:

$ rspec spec/calculator_spec.rb
./spec/calculator_spec.rb:1: uninitialized constant Calculator

Implement the simplest solution:

# in lib/calculator.rb
class Calculator
  def add(a,b)
    a + b

Be sure to require the implementation file in the spec:

# in spec/calculator_spec.rb
# - Rspec adds ./lib to the $LOAD_PATH, so you can
#   just require "calculator" directly
require "calculator"

Now run the spec again, and watch it pass:

$ rspec spec/calculator_spec.rb

Finished in 0.000315 seconds
1 example, 0 failures

Use the documentation formatter to see the resulting spec:

$ rspec spec/calculator_spec.rb --format doc
Calculator add
  returns the sum of its arguments

Finished in 0.000379 seconds
1 example, 0 failures


You can define runtime configuration options in four places. They are loaded and processed in this order:

  • ~/.rspec
  • .rspec
  • RSpec.configure
  • command line

Run rspec --help to see supported configuration options.

Also see

Something went wrong with that request. Please try again.