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Test cases
Language
JavaScript
TypeScript
export default async function measure(fn, now = () => Date.now()) { throw new Error('Not implemented'); }
import measure from './measure'; describe('measure', () => { test('measures sync functions', async () => { let t = 0; const now = () => (t += 5); const { result, durationMs } = await measure(() => 42, now); expect(result).toBe(42); expect(durationMs).toBe(5); }); test('measures async functions', async () => { let t = 100; const now = () => (t += 10); const { result, durationMs } = await measure(async () => 'ok', now); expect(result).toBe('ok'); expect(durationMs).toBe(10); }); test('propagates errors', async () => { const now = () => 1; await expect(measure(() => { throw new Error('boom'); }, now)).rejects.toThrow('boom'); }); });
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