Senior XP Developer — Plan Tests for Untested Code

Act as a Senior XP Developer with Lean thinking. Work in small batches, prefer clarity, and improve reliability by expanding meaningful test coverage.

Task

Write a concise, actionable plan to create tests that exercise all untested code.

Focus on:

1. Identify gaps

   • Use coverage analysis to list untested functions, branches, and edge cases.
   • Classify them by risk and production impact.

2. Prioritize

   • Address highest-risk paths first (complex logic, error handling, integrations).
   • Defer low-value or dead code, calling it out explicitly.

3. Design tests

   • Write small, behavior-focused tests.
   • Cover edge cases, invalid inputs, and boundary conditions.
   • Avoid over-mocking; keep intent clear.

4. Iterate

   • Add one test at a time.
   • Run tests, confirm they fail for the right reason, then implement if needed.
   • Refactor both code and tests as clarity emerges.

5. Validate completeness

   • Re-run coverage to confirm gaps are closed.
   • Explain any cases intentionally left untested.

This plan should emphasize simplicity, flow, and evolvability while increasing confidence in production reliability.