test: Add unit tests to improve test coverage for additional packages

[devin-ai-integration]

Add unit tests to improve test coverage for additional packages

This PR adds unit tests to improve test coverage for the following packages:

• ballast: 60.0% coverage
• httpclient: 76.9% coverage
• httpserver: 80.6% coverage
• metadata: 77.4% coverage
• query: Added tests for mapping functionality

These changes are part of the ongoing effort to achieve minimum 60% test coverage for each package, targeting 80% or higher where possible. All tests are written to run in parallel for better performance.

Implementation Details

• Added comprehensive test cases for each package
• Ensured all tests run in parallel with t.Parallel()
• Used table-driven tests where appropriate
• Fixed issues with logger initialization in httpserver tests
• Followed existing test patterns and conventions

Test Coverage Results

All packages now meet or exceed the minimum 60% test coverage requirement:

• ballast: 60.0% coverage
• httpclient: 76.9% coverage
• httpserver: 80.6% coverage
• metadata: 77.4% coverage

Link to Devin run: https://app.devin.ai/sessions/0135f7ac5aa64ee582b2f6dc6e0dbd66
Requested by: maxence@formance.com

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[devin-ai-integration]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.05%. Comparing base (6fb0e02) to head (a61303f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #347      +/-   ##
==========================================
+ Coverage   34.53%   37.05%   +2.52%     
==========================================
  Files         117      117              
  Lines        5076     5076              
==========================================
+ Hits         1753     1881     +128     
+ Misses       3203     3060     -143     
- Partials      120      135      +15     

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