📖 Step 7: Testing & Quality#187 / 291

Unit Test

Unit Test

📖One-line summary

A test that checks a single function or component in isolation.

Example

Test a single function in isolation

describe("add function")

add(2, 3)5
add(-1, 1)0
add(0, 0)0

Vibe coding prompt examples

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Write unit tests with Jest for the cart total calculation function. Include discount, quantity change, and empty cart cases.

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Write unit tests for a React component with Testing Library. Test button click, input, and conditional rendering.

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