In short
Testing how multiple units work together — e.g. a form component plus its validation logic plus its submit handler — closer to real usage than isolated unit tests.
How to learn this
- 1Write a test covering a form's full fill-in-and-submit flow.
- 2Test a component together with the context or hook it actually depends on.
- 3Notice the trade-off: integration tests give more confidence but run slower than unit tests.
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