chore(cli): Add a test to validate the kebab case error

[thomaspoignant]

Description

Add a test to validate the kebab case error

Checklist

• I have tested this code
• I have added unit test to cover this code
• I have followed the contributing guide

[netlify]

✅ Deploy Preview for go-feature-flag-doc-preview canceled.

Name	Link
🔨 Latest commit	4514fb0
🔍 Latest deploy log	https://app.netlify.com/projects/go-feature-flag-doc-preview/deploys/6914f1913a17110008c68fd1

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.06%. Comparing base (2e3faf5) to head (4514fb0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4298      +/-   ##
==========================================
+ Coverage   85.03%   85.06%   +0.03%     
==========================================
  Files         142      142              
  Lines        5893     5893              
==========================================
+ Hits         5011     5013       +2     
+ Misses        664      662       -2     
  Partials      218      218              

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud