Module 2: Implementation & Testing: Guided Labs

Lab 1: Walking Skeleton

Ship one end-to-end vertical slice through CI and deployment with a real datastore and observable request path.

Lab 2: Risk-Based Test Matrix

Map invariants and failure risks to unit, integration, contract, end-to-end, performance, and security checks. Delete redundant tests.

Lab 3: Defect Clinic

Take one real defect through reproduction, failing regression, diagnosis, minimal fix, verification, and written learning.

Lab 4: Maintainability Review

Run static checks, dependency review, duplication/coupling inspection, and debt triage. Repair the highest-leverage issue in a reviewable commit.

Evidence: deployed slice, matrix, test results, defect transcript, CI history, and debt ledger.