exception_details

# File lib/minitest/unit.rb, line 532
    def exception_details e, msg
      [
       "#{msg}",
       "Class: <#{e.class}>",
       "Message: <#{e.message.inspect}>",
       "---Backtrace---",
       "#{MiniTest::filter_backtrace(e.backtrace).join("\n")}",
       "---------------",
      ].join "\n"
    end