import { workNoPadZero } from '../work-no-pad-zero';

describe('workNoPadZero', () => {
  test('应在字符串前补 0 如果第一位是数字且长度小于 6', () => {
    expect(workNoPadZero('123')).toBe('000123');
    expect(workNoPadZero('1')).toBe('000001');
    expect(workNoPadZero('12345')).toBe('012345');
  });

  test('应返回原字符串 如果第一位是数字但长度大于等于 6', () => {
    expect(workNoPadZero('123456')).toBe('123456');
    expect(workNoPadZero('1234567')).toBe('1234567');
  });

  test('应返回原字符串 如果第一位不是数字', () => {
    expect(workNoPadZero('abc')).toBe('abc');
    expect(workNoPadZero('YZ123')).toBe('YZ123');
    expect(workNoPadZero('XN12')).toBe('XN12');
  });

  test('应返回原字符串 如果输入为空字符串、 null、false 或 undefined', () => {
    expect(workNoPadZero('')).toBe('');
    expect(workNoPadZero(null as any)).toBe(null);
    expect(workNoPadZero(false as any)).toBe(false);
    expect(workNoPadZero(undefined as any)).toBe(undefined);
  });
});