Prevent introduction of trailing whitespace after headings with JavaScript formatter

[kieran-ryan]

🤔 What's changed?

With the gherkin-utils JavaScript formatter, headings will have a trailing space introduced after them. When they have a title, this is not an issue, as the space is suffixed by the title itself i.e. <heading>: <title>. However, in the absence of a title - such as the typical use case of not including a title for Examples:, the formatter introduces a trailing space at the end of the headings.

This change ensures the space is included only when there is a title.

⚡️ What's your motivation?

Prevents the introduction of unexpected artifacts into gherkin tests that use the formatter - the trailing whitespace; and fixes #34.

🏷️ What kind of change is this?

• 🐛 Bug fix (non-breaking change which fixes a defect)

♻️ Anything particular you want feedback on?

To confirm the null check is required.

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

[xeger]

This seems reasonable enough; thanks for the contribution.

[aslakhellesoy]

Hi @kieran-ryan,

Thanks for your making your first contribution to Cucumber, and welcome to the Cucumber committers team! You can now push directly to this repo and all other repos under the cucumber organization! 🍾

In return for this generous offer we hope you will:

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Aslak Hellesøy
Creator of Cucumber