javascript 如何在 Mocha 测试中模拟时间的流逝，以便调用 setTimeout 回调？
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How can I simulate the passing of time in Mocha tests so that setTimeout callbacks are called?
提问by aknuds1
I need to test JavaScript code that relies on setTimeoutin order to perform periodic tasks. How can I from my Mocha tests simulate the passing of time so that setTimeout callbacks gets called?
我需要测试依赖于setTimeout 的JavaScript 代码以执行周期性任务。我如何从我的 Mocha 测试中模拟时间的流逝，以便调用 setTimeout 回调？
I am basically asking for functionality similar to Jasmine's Mock Clock, which allows you to advance JavaScript time by a number of ticks.
我基本上要求类似于Jasmine 的 Mock Clock 的功能，它允许您将 JavaScript 时间提前一些滴答声。
回答by aknuds1
I found out that Sinon.JS has support for manipulating the JavaScript clock, via sinon.useFakeTimers, as described in its Fake Timersdocumentation. This is perfect since I already use Sinon for mocking purposes, and I guess it makes sense that Mocha itself doesn't support this as it's more in the domain of a mocking library.
我发现 Sinon.JS 支持通过 sinon.useFakeTimers 操作 JavaScript 时钟，如其Fake Timers文档中所述。这是完美的，因为我已经将 Sinon 用于模拟目的，我想 Mocha 本身不支持这一点是有道理的，因为它更多地属于模拟库的领域。
Here's an example employing Mocha/Chai/Sinon:
下面是一个使用 Mocha/Chai/Sinon 的例子：
var clock;
beforeEach(function () {
clock = sinon.useFakeTimers();
});
afterEach(function () {
clock.restore();
});
it("should time out after 500 ms", function() {
var timedOut = false;
setTimeout(function () {
timedOut = true;
}, 500);
timedOut.should.be.false;
clock.tick(510);
timedOut.should.be.true;
});
