Javascript 开玩笑地模仿一个不在不同环境下工作的约会
所以我试着在我的测试中模拟一个日期,这就是我所做的:Javascript 开玩笑地模仿一个不在不同环境下工作的约会,javascript,node.js,unit-testing,mocking,jestjs,Javascript,Node.js,Unit Testing,Mocking,Jestjs,所以我试着在我的测试中模拟一个日期,这就是我所做的: const mockDate = new Date('2018-01-01'); const backupDate = Date; beforeEach(() => { (global.Date as any) = jest.fn(() => mockDate); }) afterEach(() => { (global.Date as any) = backupDate; jest.clearAllMock
const mockDate = new Date('2018-01-01');
const backupDate = Date;
beforeEach(() => {
(global.Date as any) = jest.fn(() => mockDate);
})
afterEach(() => {
(global.Date as any) = backupDate;
jest.clearAllMocks();
});
const backupDate = Date;
(global.Date as any) = jest.fn(() => mockDate);
expect(myModule).toMatchSnapshot();
(global.Date as any) = jest.fn(() => backupDate);
因此,在我的本地应用程序中,此测试运行良好,并且与我的快照相匹配:
exports[`should match with date`] = `
[MockFunction] {
"calls": Array [
Array [
Object {
"myDate" : "Mon Jan 01 2018 01:00:00 GMT+0100 (Central European Standard Time)"
}]]}
但在生产环境中,我得到的却是导致测试失败的信息:2018年1月1日周一01:00:00 GMT+0100(CET)
你知道怎么回事吗?你应该使用works来锁定时间:
let dateNowSpy;
beforeAll(() => {
// Lock Time
dateNowSpy = jest.spyOn(Date, 'now').mockImplementation(() => 1487076708000);
});
afterAll(() => {
// Unlock Time
dateNowSpy.mockRestore();
});
对于Jest上的日期和时间测试,我编写了一个名为的模块,它将使日期和时间测试简单且可控
import { advanceBy, advanceTo, clear } from 'jest-date-mock';
test('usage', () => {
advanceTo(new Date(2018, 5, 27, 0, 0, 0)); // reset to date time.
const now = Date.now();
advanceBy(3000); // advance time 3 seconds
expect(+new Date() - now).toBe(3000);
advanceBy(-1000); // advance time -1 second
expect(+new Date() - now).toBe(2000);
clear();
Date.now(); // will got current timestamp
});