Unit Testing & TDD · question
Question 4 of 91
What is the AAA pattern in unit testing?
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Re-explain
AAA stands for Arrange, Act, Assert - a common pattern for structuring unit tests:
- Arrange: Set up test data, mocks, and preconditions
- Act: Execute the method or function being tested
- Assert: Verify the expected outcome
test('calculateDiscount returns correct discount amount', () => {
// Arrange
const price = 100;
const discountPercent = 10;
// Act
const result = calculateDiscount(price, discountPercent);
// Assert
expect(result).toBe(10);
});
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