add wikis tests to improve code coverage

[polatengin]

Improve Wikis code coverage from;

----------------|---------|----------|---------|---------|------------------------------------------------------
File            | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                                    
----------------|---------|----------|---------|---------|------------------------------------------------------
      wikis.ts  |     100 |    70.58 |     100 |     100 | 39,69-89,110,145
----------------|---------|----------|---------|---------|------------------------------------------------------

to

----------------|---------|----------|---------|---------|------------------------------------------------------
File            | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                                    
----------------|---------|----------|---------|---------|------------------------------------------------------
      wikis.ts  |     100 |      100 |     100 |     100 |
----------------|---------|----------|---------|---------|------------------------------------------------------

GitHub issue number

#57 (Don't close the issue, there are other tools to improve test coverages)

Associated Risks

None

✅ PR Checklist

• I have read the contribution guidelines
• I have read the code of conduct guidelines
• Title of the pull request is clear and informative.
• 👌 Code hygiene
• 🔭 Telemetry added, updated, or N/A
• 📄 Documentation added, updated, or N/A
• 🛡️ Automated tests added, or N/A

🧪 How did you test it?

Run npm run test in the project root