Jest: Error: Uncaught [TypeError: item.set is not a function] for ImmutableJS Record

Question

I have an immutable record with a field:

Record({
  favorite: false
})

By default, ImmutableJS records have the set method to update fields in the record.

When I click on an icon in the same page, it will trigger a method favoriteItem that sets the favorite field to be true:

const favoriteItem = item => {
    item.set(favorite, true)
}

Now, I want to test this flow where a user clicks on the icon and favourites the item using Jest.

I set up my test like this:

const mockItem = Record({
  favorite: false
})

const user = userEvent.setup()
const favoriteIcon = screen.getByTestId('favorite-icon')
await user.click(favoriteIcon)

But when I run the Jest test, I get the error:

Error: Uncaught [TypeError: item.set is not a function]

This looks really basic but I can't see what's going wrong here...