Low Test Coverage: utils/transform.ts

[gitauto-ai]

Resolves #600

Summary

Add comprehensive unit tests for utils/transform.ts targeting 100% line/function/branch coverage with no changes to runtime logic.

Test Patterns

• Happy paths for typical inputs to verify expected transformations
• Option handling: defaults vs explicit overrides and precedence
• Error cases for invalid inputs and malformed options (ensuring clear error messages)
• Boundary inputs: empty values, null/undefined, whitespace-only, large payloads, deeply nested data
• Special character and Unicode handling
• Immutability: input objects are not mutated; idempotent behavior where applicable
• Branch coverage: early returns, fallback logic, and conditional feature flags
• Type and shape validation of outputs across all code paths

git fetch origin
git checkout gitauto/issue-600-20260116-124113-50qD
git pull origin gitauto/issue-600-20260116-124113-50qD