feat: add configuration tests

[tenshiAMD]

What:

• Add configuration tests.

Why:

• To make 100% test coverage.

How:

• Add configuration tests.

Checklist:

• Documentation
• Ready to be merged
• Added myself to contributors table.
  Bot Usage

[vercel]

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Name	Status	Preview	Updated
app	✅ Ready (Inspect)	Visit Preview	Sep 13, 2022 at 3:28PM (UTC)

[codecov]

Codecov Report

Base: 99.22% // Head: 100.00% // Increases project coverage by +0.77% 🎉

Coverage data is based on head (aebf797) compared to base (e6c6571).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head aebf797 differs from pull request most recent head 7999015. Consider uploading reports for the commit 7999015 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #411      +/-   ##
===========================================
+ Coverage   99.22%   100.00%   +0.77%     
===========================================
  Files          15        15              
  Lines         387       379       -8     
  Branches       47        41       -6     
===========================================
- Hits          384       379       -5     
+ Misses          3         0       -3     

Impacted Files	Coverage Δ
lib/modules/config.js	100.00% <100.00%> (+4.47%)	⬆️

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[tenshiAMD]

@gr2m @Berkmann18 100% full tests coverage for the app. Cheers! 🎉

[github-actions]

🎉 This PR is included in version 1.16.0 🎉

The release is available on GitHub release

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