Trying to call RSpec through code and load a custom formatter

gistfile1.rb

require 'rspec'
require 'nyan_cat_formatter'

group = describe 2 do
  it "should be two" do
    2.should == 3 # failing test
  end

  it "should be two" do
    2.should == 2
  end
end

RSpec.configuration.formatter = "NyanCatFormatter"
formatter = RSpec.configuration.formatters[0]
reporter = RSpec::Core::Reporter.new(formatter)
reporter.report group.examples.size do |example|
  group.run(example)
end
puts formatter.scoreboard
puts formatter.nyan_trail