export default function isEmpty(obj) {
  throw new Error('Not implemented');
}

import isEmpty from './file';

describe('isEmpty', () => {
  test('returns false for non-empty object', () => {
    expect(isEmpty({ x: 5, y: 42 })).toBe(false);
  });

  test('returns true for empty object', () => {
    expect(isEmpty({})).toBe(true);
  });

  test('returns false for non-empty array', () => {
    expect(isEmpty([null, false, 0])).toBe(false);
  });

  test('returns true for empty array', () => {
    expect(isEmpty([])).toBe(true);
  });

  test('throws TypeError for non-object/array inputs', () => {
    expect(() => isEmpty(42)).toThrow(TypeError);
    expect(() => isEmpty('foo')).toThrow(TypeError);
  });
});