feat: implement sanity tests

[guilhem]

General:

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• Have you checked to ensure there aren't other open or closed Pull Requests for the same bug/feature/question?

Pull Request Guidelines:

1. Does your submission pass tests?
2. Have you added tests?
3. Are you addressing a single feature in this PR?
4. Are your commits atomic, addressing one change per commit?
5. Are you following the conventions of the language?
6. Have you saved your large formatting changes for a different PR, so we can focus on your work?
7. Have you explained your rationale for why this feature is needed?
8. Have you linked your PR to an open issue

[codecov]

Codecov Report

❌ Patch coverage is 71.23288% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.30%. Comparing base (6738a18) to head (c6bf344).

Files with missing lines	Patch %	Lines
internal/driver/controllerserver.go	80.00%	4 Missing and 3 partials ⚠️
internal/driver/controllerserver_helper.go	79.16%	2 Missing and 3 partials ⚠️
main.go	0.00%	4 Missing ⚠️
pkg/filesystem-stats/filesystem_stats.go	0.00%	4 Missing ⚠️
internal/driver/nodeserver.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #539      +/-   ##
==========================================
+ Coverage   70.53%   71.30%   +0.77%     
==========================================
  Files          24       25       +1     
  Lines        2118     2168      +50     
==========================================
+ Hits         1494     1546      +52     
  Misses        496      496              
+ Partials      128      126       -2     

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