if ENV['COVERAGE'] || ENV['TRAVIS']
  require 'simplecov'
  require 'coveralls'

  SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter[
    SimpleCov::Formatter::HTMLFormatter,
    Coveralls::SimpleCov::Formatter
  ]
  SimpleCov.start do
    add_filter '/vendor/'
    add_filter '/spec/'
  end
end

$LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
require 'sperm'

# Some helpers for Enumerable.
#
module Enumerable
  def permutation?
    sort.to_a == (0...count).to_a
  end

  def empty?
    count == 0
  end
end