Test environments and doubles

18 procedures covering feature flags per environment, fake time and clocks, mock and stub servers, seed and fixture data, environment variables and config drift. Out of scope here: test framework selection, CI pipeline design.

Checklists

• Test environment checklist16 checks

Questions people ask about this area

• what is the difference between a mock and a stub
• why do fake timers time out a test
• what is the difference between fixtures and seed data