Example of what is possible with RSpec2

gistfile1.md

Install RSpec

$ gem install rspec

Run it!

$ rspec --color --format=d register.rb
CashRegister
  when empty
    items
      should be empty
    total
      should be == 0
  after scanning 1 and 2
    items
      should not be empty
    total
      should be == 3

Finished in 0.00697 seconds
4 examples, 0 failures

• --color - adds green/yellow/red colors to the output.
• --format=d - prints readable text instead of a bunch of ........

register.rb

# From: http://rubylearning.com/blog/2011/07/28/how-do-i-test-my-code-with-minitest/
class CashRegister
  attr_reader :items

  def initialize
    @items = []
  end

  def scan(item)
    @items << item
  end

  def total
    @items.inject(0) {|sum, item| sum += item }
  end
end

require 'rspec'

describe CashRegister do
  context "when empty" do
    its(:items) { should be_empty }
    its(:total) { should be == 0 }
  end

  context "after scanning 1 and 2" do
    before do
      subject.scan(1)
      subject.scan(2)
    end

    its(:items) { should_not be_empty }
    its(:total) { should be == (1 + 2) }
  end
end

--format=d - prints readable text instead of a bunch of ........

Belated: --format=d translates to --format=documentation, for those interested.

great, we can use subject directly.