update(test): Improve clone and redact tests

[m-mizutani]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @m-mizutani, 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 focuses on enhancing the reliability and clarity of the masq library's data masking capabilities. It achieves this by significantly improving the test coverage and documentation around how various Go data structures are cloned and redacted, particularly emphasizing secure handling of sensitive information across different field visibility and type complexities.

Highlights

• Test Suite Overhaul: The pull request introduces a significant refactoring and expansion of the test suites for the cloning and redaction functionalities. The previous clone_redact_test.go has been replaced by more granular and comprehensive tests in clone_test.go and the newly added redact_test.go.
• Improved Documentation on Redaction Behavior: The README.md has been updated to provide clearer explanations of how redaction behaves with unexported fields, embedded unexported structs, and interface fields, detailing which filters apply and when values become nil for security.
• Enhanced Test Coverage: New test cases have been added to cover a wider array of scenarios, including circular references, redaction within unexported arrays, and explicit verification of security measures where certain types (like maps with unexported keys/values or deeply nested structures) are zeroed out or become nil to prevent information leakage.
• Testability Improvements: The Masq type and its NewMasq and Redact methods have been exported in export_test.go, facilitating more direct and robust testing of the core masq functionalities.
• Dependency Update: The github.com/m-mizutani/gt dependency has been updated to version v0.1.0.

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[gemini-code-assist]

Code Review

This pull request significantly improves the test suite for the cloning and redaction logic. The refactoring of clone_redact_test.go into the new redact_test.go and the updated clone_test.go is a major step forward, making the tests much more comprehensive and maintainable. The new matrix-style tests in redact_test.go are particularly impressive. The documentation updates in README.md are also very clear and accurately reflect the library's behavior, especially around security-related cloning limitations. I've found a couple of instances of test duplication in clone_test.go that could be cleaned up to further improve maintainability, but overall this is an excellent update.