`Cucumber::CucumberExpressions::Group` can have `nil` children since cucumber-expressions v19

[Rdx31]

👓 What did you see?

The v10.2.0 release permits cumber-expressions up to v19.

The cucumber-expressions v19 release includes an important change in this PR:

children of Cucumber::CucumberExpressions::Group can now be nil

which breaks

cucumber-ruby/lib/cucumber/formatter/message_builder.rb

Line 146 in 78e472d

children: group.children.map { |child| argument_group_to_message(child) }

leading to the following error

undefined method 'map' for nil (NoMethodError)
gems/cucumber-10.2.0/lib/cucumber/formatter/message_builder.rb:149:in 'Cucumber::Formatter::MessageBuilder#argument_group_to_message'
gems/cucumber-10.2.0/lib/cucumber/formatter/message_builder.rb:137:in 'block in Cucumber::Formatter::MessageBuilder#step_match_arguments'
gems/cucumber-10.2.0/lib/cucumber/formatter/message_builder.rb:132:in 'Array#map'
gems/cucumber-10.2.0/lib/cucumber/formatter/message_builder.rb:132:in 'Cucumber::Formatter::MessageBuilder#step_match_arguments'

✅ What did you expect to see?

I would have expected no error :)

📦 Which tool/library version are you using?

No response

🔬 How could we reproduce it?

No response

📚 Any additional context?

No response

[vizv]

I have already opened a PR #1819 to fix this

[luke-hill]

For now using a version of expressions in the v18 series will not cause this error

There is a PR as mentioned. However the next version intended to go out for cucumber-ruby is v11 which will be a step towards more CCK conformance as well as beginning to port over some of the formatters

[luke-hill]

Update for anyone watching. All fixes for the CCK compliance are now done. So this issue that is fixed in main will be released in v11 which is expected very soon. One more PR to merge then a release will be cut