The 100% test coverage loop

A goal-based coding-agent workflow that identifies uncovered behavior, adds meaningful tests, and stops when the full suite passes at 100% coverage.

Use when

Use this when 100% coverage is an explicit project requirement and the repository has a trustworthy coverage command, clear exclusions, and a test suite that can be run repeatedly.

The loop

Add tests until we have 100% test coverage.

Steps

• Run the complete test suite with coverage and save the baseline report.
• Prioritize uncovered branches and behavior by risk instead of file order.
• Add tests that assert meaningful outcomes, failure paths, and boundary conditions.
• Repeat until the full suite passes and the configured coverage report reaches 100%.

Verification

The full test suite passes at 100% coverage. Use the project's coverage report as the source of truth.

Why it works

A concrete coverage target gives the agent a measurable stopping condition and makes skipped code visible. Risk-first ordering keeps the work focused on behavior that matters.