refactor: extract S3 test helpers for reuse

[kalbasit]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @kalbasit, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the S3 storage test suite to improve its modularity and robustness. By centralizing test setup and introducing advanced mocking capabilities, the changes facilitate more thorough and isolated testing of S3 interactions, particularly error handling, without external dependencies. This leads to more reliable and maintainable tests for the S3 storage component.

Highlights

• Test Helper Extraction: Extracted common S3 test configuration logic into a new testhelper package, promoting reusability and cleaner test code across the project.
• Enhanced Error Path Testing: Introduced mock HTTP transport functions and S3 response helpers to simulate various S3 API responses, enabling comprehensive unit testing of error paths without requiring a live S3 connection.
• New Unit and Integration Tests: Added a suite of new unit tests covering diverse S3 error scenarios for bucket access, object listing, and NAR/NARInfo operations, alongside new integration tests for WalkNarInfos and bucket access errors.
• Internal Client Exposure for Testing: Exposed the internal MinIO client via a GetClient() method in export_test.go, allowing for more focused and direct testing of S3 store interactions.

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[kalbasit]

• style: apply nix fmt to documentation and project files #671
• feat: add CLI and Helm configuration for CDC and S3 #670
• feat: integrate CDC with cache and implement chunk GC #669
• feat: add S3 storage support for chunks #668
• refactor: extract S3 test helpers for reuse #676 👈 (View in Graphite)
• refactor: move S3 configuration to its own package #675
• main

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[gemini-code-assist]

Code Review

This pull request is a solid refactoring that successfully extracts S3 test helpers for reuse, improving the modularity of the test suite. The addition of numerous unit tests for error paths using HTTP mocking is a significant enhancement to the test coverage and robustness of the S3 storage implementation. The code is well-structured and the changes are clear. I have a couple of minor suggestions to further improve code clarity and remove redundancy.

[kalbasit]

/gemini review

[gemini-code-assist]

Code Review

This pull request is a nice refactoring that extracts S3 test configuration into a reusable helper, cleaning up s3_test.go. The addition of unit tests for various error paths using a mocked HTTP transport is a significant improvement, as it increases test coverage and robustness without depending on a live S3 service. My review includes a few suggestions to make the new test code even more concise.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.16%. Comparing base (f0dd805) to head (0eca63b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #676       +/-   ##
===========================================
+ Coverage   67.98%   79.16%   +11.18%     
===========================================
  Files           2        2               
  Lines         456      456               
===========================================
+ Hits          310      361       +51     
+ Misses        129       83       -46     
+ Partials       17       12        -5     

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