import { isNull } from './index';

describe('测试 types 模块 isNull 方法', () => {
  it('Number类型', () => {
    expect(isNull(111)).toBe(false);
  });

  it('String类型', () => {
    expect(isNull('11111')).toBe(false);
  });

  it('Array类型', () => {
    expect(isNull(['11111', '22222'])).toBe(false);
  });

  it('Object类型', () => {
    expect(isNull({ name: 'xxx' })).toBe(false);
  });

  it('undefined', () => {
    expect(isNull(undefined)).toBe(false);
  });

  it('Null', () => {
    expect(isNull(null)).toBe(true);
  });
});