Let firefox choose the bidi port by default

[tomhughes]

User description

If the user hasn't asked for a specific port then just let firefox choose a random one.

🔗 Related Issues

Fixes #15707.

💥 What does this PR do?

Prevents race conditions choosing a bidi port by letting firefox choose.

🔧 Implementation Notes

Implementation is as suggested in #15707 (comment).

💡 Additional Considerations

None.

🔄 Types of changes

• Bug fix (backwards compatible)

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PR Type

Bug fix, Tests

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Description

• Let Firefox choose BiDi port by default to avoid race conditions

• Update service initialization to use '--websocket-port=0' unless specified

• Remove and revise tests for websocket port assignment logic

• Add new unit tests for argument handling in service initialization

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Changes walkthrough 📝

	Relevant files
Bug fix	service.rb Default to Firefox-chosen BiDi port in service initialization rb/lib/selenium/webdriver/firefox/service.rb Change default '--websocket-port' argument to '0' unless specified Prevents manual port probing and potential race conditions Adjust logic to skip adding argument if already present +2/-2
Tests	service_spec.rb Remove integration test for random websocket port assignment rb/spec/integration/selenium/webdriver/firefox/service_spec.rb Remove test asserting different websocket ports for two services Clean up BiDi port assignment expectations in integration tests +0/-15    service_spec.rb Revise and add unit tests for websocket port argument handling rb/spec/unit/selenium/webdriver/firefox/service_spec.rb Update test to expect websocket port '0' by default Add test to ensure custom websocket port is respected Add test to ensure '--websocket-port' is not duplicated +10/-2

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 15707 - Fully compliant Compliant requirements: • Fix issue with Firefox 136+ failing when multiple instances are started in parallel • Address race condition where multiple threads can allocate the same BiDi port • Ensure Firefox instances can start properly in parallel testing environments • Fix regression in Selenium 4.32.0 ruby bindings

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Argument Handling The condition to check for existing arguments could be more robust. Currently it checks if any argument "includes" the string, which might match partial arguments. Consider using exact matching or regex patterns for more precise detection. unless args.any? { |arg| arg.include?('--connect-existing') || arg.include?('--websocket-port') } args << '--websocket-port'

[qodo-merge-pro]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
General	Improve argument matching precision The current implementation only checks if arguments contain the string '--websocket-port', which could match partial arguments like '--websocket-port-timeout'. Use a more precise check to ensure exact matching of the '--websocket-port' argument. rb/lib/selenium/webdriver/firefox/service.rb [31-34] -unless args.any? { |arg| arg.include?('--connect-existing') || arg.include?('--websocket-port') } +unless args.any? { |arg| arg.include?('--connect-existing') || arg == '--websocket-port' || arg.start_with?('--websocket-port=') } args << '--websocket-port' args << '0' end Apply / Chat Suggestion importance[1-10]: 8 __ Why: The suggestion correctly identifies a potential bug where partial matches like --websocket-port-timeout would incorrectly be treated as the --websocket-port argument. The improved code with exact matching using arg == '--websocket-port' or arg.start_with?('--websocket-port=') prevents this issue, making the argument handling more robust.	Medium
Update

[aguspe]

Thank you for your contribution @tomhughes !