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Unit Test
Create focused tests for normal, boundary, and failure cases.
When to use it
Use this to plan tests for behavior across normal inputs and boundary cases.
Useful inputs
- Unit under test
- Expected behavior
- Boundary cases and dependencies
Instruction
List behaviors in Given/When/Then form and provide isolated unit test examples, including boundaries and dependencies.
Example input
Method: Calculate cart total. Rule: Discount is 0–50%. Cases: Empty cart, exactly 50%, invalid discount.
Example result
- Valid cart and 0% discount → subtotal is unchanged. - Valid cart and 50% discount → total is halved. - Empty cart → the defined empty-cart behavior. - 51% discount → validation error. Fix the expected currency rounding rule in each test.
Common pitfall
Do not write tests that merely repeat current output; derive expected results from requirements.