test: user-agent header can be set

[ashatch]

Pull request checklist

Please check if your PR fulfills the following requirements:

• [x] Build (npm run build) was run locally and any changes were pushed
• [x] Tests (npm run test) for the changes have been added (for bug fixes / features)
• [x] Docs (npm run doc) have been reviewed and added / updated if needed (for bug fixes / features)
• [x] PR title and git commit messages conform to the conventionalcommits specification

Pull request type

Please check the type of change your PR introduces:

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [x] Other (please describe): test only

Does this introduce a breaking change?

• [ ] Yes
• [x] No

[coveralls]

Pull Request Test Coverage Report for Build 4981172798

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 95.649%

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Totals
Change from base Build 4025667811:	0.2%
Covered Lines:	960
Relevant Lines:	977

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 10575629240

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 95.491%

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Totals
Change from base Build 7813868124:	0.2%
Covered Lines:	976
Relevant Lines:	995

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💛 - Coveralls