Unit Test | Skills Pool

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Unit Test

Guidelines for writing and reviewing unit tests. Covers AAA pattern, test naming, determinism, mocking strategies, and reviewer responsibilities. Use when creating or updating *.test.* files, reviewing test PRs, or refactoring tests to improve clarity and coverage.

kyzooghost0 스타2026. 3. 6.

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카테고리: 테스팅

스킬 내용

Unit Testing Guidelines

Best practices for writing and reviewing unit tests. Contains rules covering test structure, naming, determinism, and code review.

Reference: MetaMask Unit Testing Guidelines

When to Apply

Reference these guidelines when:

Writing new unit tests
Reviewing test code in PRs
Refactoring existing tests
Debugging flaky or brittle tests
Improving test coverage

Rule Categories by Priority

Priority	Category	Impact	Rule File
1	Best Practices	CRITICAL

관련 스킬

it('indicates expired milk when past due date', () => {
  // Arrange
  const today = new Date('2025-06-01');
  const milk = { expiration: new Date('2025-05-30') };

  // Act
  const result = isMilkGood(today, milk);

  // Assert
  expect(result).toBe(false);
});

it('displays an error when input is invalid', () => { ... });

jest.useFakeTimers();
jest.setSystemTime(new Date('2024-01-01'));

// Break the SuT and make sure this test fails
expect(result).toBe(false);