'UnhandledPromiseRejection when I am trying to spy window object (jest + nuxt js)

I am using jest to spy window object to define my own window.scrollY value for my nuxt js component.

My jest codes:

const winSpy = jest.spyOn(global, 'window', 'get')
winSpy.mockImplementation(() => ({
  scrollY: 200
}))

It works fine, but the error below is shown in terminal:

node:internal/process/promises:265
        triggerUncaughtException(err, true /* fromPromise */);
        ^

[UnhandledPromiseRejection: This error originated either by throwing inside of an 
async function without a catch block, or by rejecting a promise which was not handled 
with .catch(). The promise rejected with the reason "TypeError: Cannot read 
properties of undefined (reading 'get')".] {

What is the problem?

Can anyone help me to fix that?

vue.jsjestjsnuxt.js


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