Has anyone successfully implemented something similar to
jest.spyOn(global, 'Date').mockImplementation(() => now);I've searched through the Deno documentation for mock functionality available at this link, as well as explored the mock time feature detailed here. However, it doesn't seem like either of these options will effectively replace the new Date() with the desired mocked implementation.
You have the ability to directly override any global variable - they can be accessed as properties/methods on globalThis.
For example, here's a demonstration (not specific to any particular testing framework) that swaps out the global Date class with a custom class containing a method called toString:
class CustomClass {
toString() {
return "Just an illustration";
}
}
function replaceDateAndRetrieveOriginalFn() {
const originalDate = globalThis.Date;
globalThis.Date = CustomClass;
return () => void (globalThis.Date = originalDate);
}
console.log(new Date().toString()); //=> <A string representing the current date>
const restore = replaceDateAndRetrieveOriginalFn();
console.log(new Date().toString()); //=> "Just an illustration"
restore();
console.log(new Date().toString()); //=> <A string representing the current date>
If you want to mimic the behavior of new Date in Deno, one way to do it is by using @sinonjs/fake-timers
import FakeTimers from "npm:@sinonjs/fake-timers";
import { assertEquals, assertNotEquals } from "https://deno.land/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="f2818696b2c2dcc3cbc2dcc2">[email protected]</a>/testing/asserts.ts";
Deno.test("New Year", () => {
const clock = FakeTimers.install();
clock.setSystemTime(new Date('2020-01-01'));
// Celebrating New Year
assertEquals(new Date().toDateString(), 'Wed Jan 01 2020');
clock.uninstall();
});
Deno.test("now", () => {
// Not yet New Year
assertNotEquals(new Date().toDateString(), 'Wed Jan 01 2020');
});
For those already using jest, you can opt for jest.useFakeTimers() along with .setSystemTime(now?: number | Date)
jest
.useFakeTimers()
.setSystemTime(new Date('2020-01-01'));
Remember to switch back to real timers when finished by calling jest.useRealTimers()
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