Improve test coverage

[serroba]

No description provided.

[Copilot]

Pull request overview

This PR improves test coverage for the leaky bucket rate limiter by introducing clock injection for time-dependent testing. The changes enable deterministic testing of time-sensitive behavior without relying on actual time delays.

Key changes:

• Added clock abstraction to LeakyLimiter for testability
• Added three new test cases covering drain behavior and clock edge cases
• Changed test struct fields from exported to unexported (style consistency)

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
bucket/leaky.go	Adds clock interface injection to LeakyLimiter with a new constructor for testing
bucket/leaky_test.go	Adds three new test cases for clock backward movement, full drain, and partial drain behaviors
registry/registry_test.go	Changes struct fields from exported to unexported in test-only configuration types

After thoroughly reviewing the changes, I found no issues with this pull request. The changes are well-implemented:

1. bucket/leaky.go: The clock abstraction follows the same pattern already established in bucket/token.go, maintaining consistency across the codebase.

2. bucket/leaky_test.go: The new tests properly leverage the existing testClock type from bucket/token_test.go (both in package bucket_test), and they test important edge cases:

   • Clock going backwards (should not drain)
   • Full drain after time advancement
   • Partial drain with fractional time advancement

3. registry/registry_test.go: The change from exported to unexported fields is a stylistic improvement for test-only structs. Since the struct literals are used within the same package, this works correctly and is a common Go idiom for internal test types.

The PR successfully achieves its goal of improving test coverage with clean, maintainable code.

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