Duration in HTML report is wrong

[vincent-psarga]

Describe the bug

When running cucumber -f html, the html report has a duration field with incorrect data (sometimes even a negative duration).

Not sure if this comes from the cucumber/react lib or the values generated in the messages.

Expected behavior

Have a valid duration for the run.

Extra would be a readable format too (not like 1234567890ms but 14d 6h 56min 7s 890ms)

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Your Environment

• Versions used: 4.1.0
• Operating System and version [e.g. * Operating System and version:]
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[vincent-psarga]

I've made some tests about that:

require 'cucumber/formatter/io'
require 'cucumber/formatter/message_builder'

module Cucumber
  module Formatter
    # The formatter used for <tt>--format message</tt>
    class TestRunDuration < MessageBuilder
      include Io

      def initialize(config)
        @io = ensure_io(config.out_stream)
        super(config)
      end

      def output_envelope(envelope)
        if envelope.test_run_started
          Kernel.puts "Started at: #{timestamp_to_time(envelope.test_run_started.timestamp)}"
        end

        if envelope.test_run_finished
          Kernel.puts "Finished at: #{timestamp_to_time(envelope.test_run_finished.timestamp)}"
        end
      end
    end
  end
end

Which outputs:

bundle exec cucumber -f Cucumber::Formatter::TestRunDuration                                  

WARNING: Nokogiri was built against LibXML version 2.9.10, but has dynamically loaded 2.9.4
Started at: 2020-07-01 11:31:06 +0200
Finished at: 2020-07-01 11:31:10 +0200

So that looks good or the Ruby side (at least, Ruby is able to recreate a Date which seems more than plausible from the Timestamps of the TestRunStarted and TestRunFinished messages.

Now when feeding that to Javascript (in cucucmber/react), I'm unable to translate that to a real date.

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