This test should fail every time. But note the random numbers it fails with when running standalone and through spork.

random_number_spec.rb

require 'spec_helper'

describe 'Random numbers' do
  it 'fails every time' do
    numbers = 10.times.map { rand(100) }
    numbers.join(', ').should eq 'the Tardis'
  end
end

spec_helper.rb

require 'rubygems'
require 'rspec'
require 'spork'

Spork.prefork do
  RSpec.configure do |config|
    config.treat_symbols_as_metadata_keys_with_true_values = true
    config.run_all_when_everything_filtered = true

    config.order = 'random'
  end
end

Spork.each_run do
end