Testing · Middle · Question 68 of 75

Why is deep nesting of `describe` blocks with shared `let` variables problematic?

✓Correct answer: To understand one test you must read many hooks above it; inline setup or small helper functions are clearer
2Jest limits nesting to 3 levels
3It makes tests run in series

Explanation

Kent C. Dodds: prefer flat tests with explicit setup functions (“Avoid Nesting when you're Testing”).

Further reading

Kent C. Dodds: Avoid Nesting when you're Testing ↗

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