Javascript 如何使用 sinon 存根 new Date()？
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How do I stub new Date() using sinon?
提问by MrHen
I want to verify that various date fields were updated properly but I don't want to mess around with predicting when new Date()was called. How do I stub out the Date constructor?
我想验证各种日期字段是否已正确更新，但我不想在预测何时new Date()被调用。如何存根 Date 构造函数？
import sinon = require('sinon');
import should = require('should');
describe('tests', () => {
var sandbox;
var now = new Date();
beforeEach(() => {
sandbox = sinon.sandbox.create();
});
afterEach(() => {
sandbox.restore();
});
var now = new Date();
it('sets create_date', done => {
sandbox.stub(Date).returns(now); // does not work
Widget.create((err, widget) => {
should.not.exist(err);
should.exist(widget);
widget.create_date.should.eql(now);
done();
});
});
});
In case it is relevant, these tests are running in a node app and we use TypeScript.
如果相关，这些测试在节点应用程序中运行，我们使用 TypeScript。
回答by Alex Booker
I suspectyou want the useFakeTimersfunction:
我怀疑你想要这个useFakeTimers功能：
var now = new Date();
var clock = sinon.useFakeTimers(now.getTime());
//assertions
clock.restore();
This is plain JS. A working TypeScript/JavaScript example:
这是纯JS。一个有效的 TypeScript/JavaScript 示例：
var now = new Date();
beforeEach(() => {
sandbox = sinon.sandbox.create();
clock = sinon.useFakeTimers(now.getTime());
});
afterEach(() => {
sandbox.restore();
clock.restore();
});
回答by realplay
sinon.useFakeTimers()was breaking some of my tests for some reason, I had to stub Date.now()
sinon.useFakeTimers()由于某种原因破坏了我的一些测试，我不得不存根 Date.now()
sinon.stub(Date, 'now').returns(now);
In that case in the code instead of const now = new Date();you can do
在这种情况下，在代码而不是const now = new Date();你可以做
const now = new Date(Date.now());
Or consider option of using momentlibrary for date related stuff. Stubbing moment is easy.
或者考虑使用时刻库来处理与日期相关的内容。存根时刻很容易。
回答by Anatoli Klamer
I found this question when i was looking to solution how to mock Dateconstructor ONLY.
I wanted to use same date on every test but to avoid mocking setTimeout.
Sinon is using lolexinternally
Mine solution is to provide object as parameter to sinon:
当我想解决如何Date仅模拟构造函数时，我发现了这个问题。我想在每次测试中使用相同的日期，但要避免嘲笑setTimeout。Sinon 在内部使用lolex我的解决方案是将对象作为参数提供给 sinon：
let clock;
before(async function () {
clock = sinon.useFakeTimers({
now: new Date(2019, 1, 1, 0, 0),
shouldAdvanceTime: true,
advanceTimeDelta: 20
});
})
after(function () {
clock.restore();
})
Other possible parameters you can find in lolexAPI
您可以在lolexAPI 中找到的其他可能参数
