import lastOf from './lastOf';

test('should return last element', () => expect(lastOf(Object.freeze(['1', '2', '3']))).toBe('3'));
test('when passed empty array should return undefined', () => expect(lastOf([])).toBeUndefined());
test('when passed undefined should return undefined', () => expect(lastOf(undefined)).toBeUndefined());
test('when passed null should return undefined', () => expect(lastOf(null as any)).toBeUndefined());