Add high-quality unit tests (0 functions, 0 cases)

[tylercodeai-dev]

What

This PR introduces comprehensive unit tests for critical modules, focusing on correctness, resilience, and maintainability.

Why

Improves confidence in core business logic and guards against regressions. The test suite follows pragmatic best practices championed by Google and similar large-scale engineering organizations.

Scope

• Source under test: [unknown source]
• Generated test file: [unknown]
• Functions covered: 0
• Test cases: 0

Design & Approach

• Framework: Vitest (TypeScript)
• Clear Arrange-Act-Assert structure
• Deterministic mocks for external deps
• Edge cases and error paths explicitly validated
• Consistent naming: "should [expected] when [condition]"
• Small, focused tests; no incidental complexity

Business Logic Understanding

Functions analyzed and their scenarios:

• [spec not available]

Quality

• Syntax valid: Needs follow-up
• Best practices: Partial
• Lint/style consistency: aligned with repo defaults

Reviewer Notes

• Start with the test names for intent
• Verify mocks align with real dependency boundaries
• Suggest additional cases where ambiguity exists
• Feel free to request naming/style tweaks

Checklist

• Tests compile
• Structure and naming are consistent
• Error and boundary cases included
• Minimal surface area for flakiness