import { deepMerge, isObject, sleep } from '@shared/lib/utils'; describe('isObject', () => { it('returns true for plain objects', () => { expect(isObject({})).toBe(true); expect(isObject({ a: 1 })).toBe(true); }); it('returns false for arrays', () => { expect(isObject([])).toBe(false); }); it('returns false for null', () => { expect(isObject(null)).toBe(false); }); it('returns false for other types', () => { expect(isObject(42)).toBe(false); expect(isObject('string')).toBe(false); expect(isObject(undefined)).toBe(false); }); }); describe('deepMerge', () => { it('merges two flat objects', () => { const result = deepMerge({ a: 1 }, { b: 2 }); expect(result).toEqual({ a: 1, b: 2 }); }); it('merges deeply nested objects', () => { const result = deepMerge({ a: { x: 1 }, b: 2 }, { a: { y: 3 }, c: 4 }); expect(result).toEqual({ a: { x: 1, y: 3 }, b: 2, c: 4 }); }); it('overwrites non-object values', () => { const result = deepMerge({ a: 1 }, { a: 2 }); expect(result).toEqual({ a: 2 }); }); it('returns null if any input is not an object', () => { expect(deepMerge(null, { a: 1 })).toBeNull(); expect(deepMerge({ a: 1 }, 123)).toBeNull(); }); }); describe('sleep', () => { it('resolves after given time', async () => { const start = Date.now(); await sleep(50); const duration = Date.now() - start; // Note: setTimeout can fire slightly early due to timer coalescing, // so we allow some buffer in the assertion expect(duration).toBeGreaterThanOrEqual(47); }); });