clean_backtrace

# File actionpack/lib/action_controller/test_case.rb, line 118
      def clean_backtrace(&block)
        yield
      rescue ActiveSupport::TestCase::Assertion => error
        framework_path = Regexp.new(File.expand_path("#{File.dirname(__FILE__)}/assertions"))
        error.backtrace.reject! { |line| File.expand_path(line) =~ framework_path }
        raise
      end