gistfile1.rb

require 'rr'

class CrazyMath
  def self.fib(n)
    if n < 3
      1
    else
      CrazyMath.fib(n - 1) + CrazyMath.fib(n - 2)
    end
  end
end



Spec::Runner.configure do |config|
  config.mock_with :rr
end

describe "Fib" do

  it "fib 1" do
    CrazyMath.fib(1).should == 1
  end

  it "fib 2" do
    CrazyMath.fib(2).should == 1
  end

  it "fib 6" do
    mock.proxy(CrazyMath).fib(1).times(any_times)
    mock.proxy(CrazyMath).fib(2).times(any_times)
    mock.proxy(CrazyMath).fib(3).times(any_times)
    mock.proxy(CrazyMath).fib(4).times(any_times)
    mock.proxy(CrazyMath).fib(5).times(any_times)
    mock.proxy(CrazyMath).fib(6) 

    CrazyMath.fib(6).should == 8
  end

end