author-regression-test

Regression tests that enforce red-before-green verify the derived assertion is failing against the current codebase before writing the test file. This prevents accidental already-green tests that do not protect against the defect.

Deriving a mechanical assertion from RCA turns root-cause analysis and fix design into specific assertions using grep, glob, file-shape checks, or unit-test commands. This ensures the regression test is observable and deterministic.

A YAML eval-spec for regression testing is a structured regression-test.yaml artifact that includes expected red and green states along with metadata for later execution. It captures the defect and proves the fix causes a red-to-green state transition.

You generate regression test artifacts by providing the paths to your rca.yaml and design.yaml, your project_root, and an output_base. The workflow authors a regression-test.yaml file that verifies the fix causes a red-to-green state transition.

Regression tests that pass before applying the fix are accidental already-green tests that fail to protect against the defect. Red-before-green enforcement verifies the derived assertion is failing against the current codebase before writing the test.

Grep assertions are supported for deterministic verification in regression testing. The defect-to-assertion derivation process turns root-cause analysis into specific mechanical assertions using grep, glob, file-shape checks, or unit-test commands.