[Code Quality] Improve Test Coverage for High-Churn Code in pkg/ Directory

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Description

The Daily Code Metrics Report (Discussion #13766) revealed critical test coverage issues:

• Current test-to-source ratio: 0.70 (below recommended 1.0+)
• Test coverage declined 68.82% in the last 7 days
• High code churn: 2,004 files modified in 7 days
• pkg/ directory dominates at 353,948 LOC (65.3% of codebase)

Problem

With extremely high code volatility and declining test coverage, the risk of regressions has increased significantly. The quality score dropped from ~72 to 58 in 7 days, primarily due to insufficient test coverage keeping pace with code changes.

Suggested Changes

Focus on the highest-churn areas in pkg/ directory:

1. Identify High-Churn, Low-Coverage Files

   • Use git log to find files with most commits in last 7 days
   • Cross-reference with files lacking test coverage
   • Prioritize files in critical paths (compilation, workflow execution)

2. Add Table-Driven Tests

   • Use Go's table-driven test pattern for comprehensive coverage
   • Test both happy paths and error conditions
   • Include edge cases and boundary conditions

3. Target High-Impact Areas First

   • Workflow compilation logic (pkg/workflow/)
   • CLI command handlers (pkg/cli/)
   • Validation and parsing (pkg/parser/)

Success Criteria

• Test-to-source ratio increases from 0.70 to at least 0.85
• All files with >10 commits in last 7 days have corresponding test files
• Quality score improves from 58 to at least 65
• No new code added without accompanying tests

Files Affected

Primary focus areas:

• pkg/workflow/*.go - Core compilation logic
• pkg/cli/*.go - Command handlers
• pkg/parser/*.go - Frontmatter parsing

Source

Extracted from Daily Code Metrics Report - 2026-02-04

Priority

High - The 68.82% decline in test coverage over 7 days combined with high code churn creates significant regression risk. This issue directly impacts code reliability and maintainability.

AI generated by Discussion Task Miner - Code Quality Improvement Agent

• expires on Feb 6, 2026, 5:24 AM UTC