class Faraday::Adapter::Test::Stub

def headers_match?(request_headers)
  if strict_mode
    headers_with_user_agent = headers.dup.tap do |hs|
      # NOTE: Set User-Agent in case it's not set when creating Stubs.
      #       Users would not want to set Faraday's User-Agent explicitly.
      hs[:user_agent] ||= Connection::USER_AGENT
    end
    return Set.new(headers_with_user_agent) == Set.new(request_headers)
  end
  headers.keys.all? do |key|
    request_headers[key] == headers[key]
  end
end