Migrate to forked Cucumber 0.10

[ilslv]

Synopsis

Upgrade to a new version of cucumber_rust.

Solution

Introduce concurrent tests runner.

Checklist

• Created PR:
  • In draft mode
  • Name contains Draft: prefix
  • Name contains issue reference
  • Has k:: labels applied
  • Has assignee
• Documentation is updated (if required)
• Tests are updated (if required)
• Changes conform code style
• CHANGELOG entry is added (if required)
• FCM (final commit message) is posted
  • and approved
• Review is completed and changes are approved
• Before merge:
  • Milestone is set
  • PR's name and description are correct and up-to-date
  • Draft: prefix is removed
  • All temporary labels are removed

[ilslv]

@tyranron there is a problem, while running concurrent tests for firefox, because geckodriver doesn't support concurrent sessions: mozilla/geckodriver#1523 (comment), jonhoo/fantoccini#111 (comment). While chrome works just fine.

There already was an effort to hack around this: jonhoo/fantoccini#100. We can try merging this (seems like pretty straightforward task) or just run tests as @serial in case of firefox.

[ilslv]

@tyranron we'll have to fallback to serial scenario execution, because even if we'll have multiple connections to single WebDriver client, we won't get isolation. This means, if one connection will redirect to foo.com and later second connection will redirect to bar.com, first connection will work with bar.com too.

[tyranron]

@ilslv can we enable serial execution just for Firefox and leave it concurrent for Chrome?

[ilslv]

@tyranron yep, already done that

[tyranron]

@ilslv ok, that will do then! Just leave a fat comment explaining why that is done and we're ready for review, I guess.

[ilslv]

FCM

Migrate to forked Cucumber 0.10 (#3)

[ilslv]

@tyranron I've decreased max_concurrent_scenarios to 5 to avoid hyper IncompleteMessage and CannelClosed errors. Locally I've been running with debug=no and 10 max_concurrent_scenarios just fine and got confused, once haven't find this option on CI. Is there a reason CI tests are running in debug?

[tyranron]

@ilslv no, I think it has sense to run CI in release mode.