An interactive concept flow for choose tests by the failure they can catch, from its assumptions through the main operation and boundary checks.
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readyTests provide evidence about behavior at different boundaries. Unit tests isolate a small decision; integration tests exercise collaboration between components; end-to-end tests validate a user-visible path. Each level trades feedback speed, realism, and setup cost differently.
Use the stages in order to explain choose tests by the failure they can catch. Each stage makes one assumption visible: what the operation promises, what representation it uses, how state changes, which boundary can invalidate a shortcut, and what evidence confirms the result.
For a worked explanation, continue to the topic article and execution trace.
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