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TypeScript testing with Vitest/Jest: file structure, mocking strategy, async patterns, and coverage targets
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Architecture decisions: layering, design patterns, microservices trade-offs, and domain-driven design
Python architecture: PEP-8, type hints, clean layering, dependency injection, and testing strategy
General code review process: priority ordering, what to block on, how to give actionable feedback
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TypeScript refactoring: SOLID principles, DRY, type safety improvements, and eliminating code smells
| name | testing-typescript |
| description | TypeScript testing with Vitest/Jest: file structure, mocking strategy, async patterns, and coverage targets |
vitest run / vitest run --coveragesrc/utils/format.ts → src/utils/format.test.tstests/fixtures/ or src/__tests__/helpers/describe('formatDate', () => {
it('should return ISO date string when given a valid Date', () => {
// Arrange
const date = new Date('2026-01-15');
// Act
const result = formatDate(date);
// Assert
expect(result).toBe('2026-01-15');
});
});
// Module mock — top of file
vi.mock('../services/emailService');
// Spy without full mock
const spy = vi.spyOn(mailer, 'send').mockResolvedValue(undefined);
// Restore after each test
afterEach(() => vi.restoreAllMocks());
// Time control
beforeEach(() => vi.useFakeTimers());
afterEach(() => vi.useRealTimers());
// Always await; use assertions count for safety
it('should reject with AuthError when token is expired', async () => {
expect.assertions(1);
await expect(verifyToken('expired')).rejects.toThrow('Token expired');
});