Choose an evidence exercise: defects, contracts, load or user journeys

Read the section first. Work in this order; each project isolates one skill. Each link opens one complete build brief with a concrete contract, a baseline, two changed requirements, and the original staged AI prompts.

These are five project briefs, not five supplied applications. All prompts are constructed practice.

1. Measure whether existing checks detect real defects

Measure whether existing checks detect real defects — Measure whether tests detect contract-breaking mutations.

2. Protect API response types, units and compatibility

Protect API response types, units and compatibility — Locate actual request, response and semantic contract enforcement.

3. Reproduce and remove order-dependent failures

Reproduce and remove order-dependent failures — Turn nondeterminism into a reproducible failing schedule.

4. Measure API capacity with controlled arrival rates

Measure API capacity with controlled arrival rates — Distinguish offered load, admitted work and resource saturation.

5. Design and run a synthetic reading-list journey

Design and run a synthetic reading-list journey — Monitor a user journey and the monitor’s own missing signal.