jest - mockReturnValue : Promise<boolean>

Question

I am new and I want to mock a function that returns a Promise<boolean>. I did this:

service.changeBookingAsync = jest.fn().mockReturnValue(boolean);

but I got this error :

error TS2693: 'boolean' only refers to a type, but is being used as a value here.

Answer 1

If you want to mock a Promise you have to use this:

jest.fn().mockImplementation(() => Promise.resolve(value));

Answer 2

Agree with @Max answer

Syntactic sugar function will be this way :

jest.fn().mockResolvedValue(value);