module RSpec::ExampleGroups

def self.base_name_for(group)
  return "Anonymous".dup if group.description.empty?
  # Convert to CamelCase.
  name = ' ' + group.description
  name.gsub!(/[^0-9a-zA-Z]+([0-9a-zA-Z])/) do
    match = ::Regexp.last_match[1]
    match.upcase!
    match
  end
  name.lstrip!                # Remove leading whitespace
  name.gsub!(/\W/, ''.freeze) # JRuby, RBX and others don't like non-ascii in const names
  # Ruby requires first const letter to be A-Z. Use `Nested`
  # as necessary to enforce that.
  name.gsub!(/\A([^A-Z]|\z)/, 'Nested\1'.freeze)
  name
end