# File lib/test/rails/controller_test_case.rb, line 223
  def xml_http_request(request_method, action, parameters = nil)
    @request.env['REQUEST_METHOD'] = request_method.to_s

    @request.env['HTTP_X_REQUESTED_WITH'] = 'XMLHttpRequest'
    @request.env['HTTP_ACCEPT'] = 'text/javascript, text/html, application/xml, text/xml, */*'

    result = process action, parameters

    @request.env.delete 'HTTP_X_REQUESTED_WITH'
    @request.env.delete 'HTTP_ACCEPT'

    return result
  end