class Gem::FakeFetcher

def find_data(path)
  return File.read path.path if URI === path and 'file' == path.scheme
  if URI === path and "URI::#{path.scheme.upcase}" != path.class.name then
    raise ArgumentError,
      "mismatch for scheme #{path.scheme} and class #{path.class}"
  end
  path = path.to_s
  @paths << path
  raise ArgumentError, 'need full URI' unless path =~ %r'^https?://'
  unless @data.key? path then
    raise Gem::RemoteFetcher::FetchError.new("no data for #{path}", path)
  end
  @data[path]
end