chore: improve coverage for example.js

[is2ei]

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[coveralls]

Pull Request Test Coverage Report for Build 2237613670

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.6%) to 86.517%

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Totals
Change from base Build 2233372807:	0.6%
Covered Lines:	211
Relevant Lines:	235

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 2237613670

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.6%) to 86.517%

---

Totals
Change from base Build 2233372807:	0.6%
Covered Lines:	211
Relevant Lines:	235

---

💛 - Coveralls