enzyme mount is not working for component code example

Example: enzyme mount is not working for component

it('should display message retrieved with ajax request', 
    async (done) => {
       const fakePromise = Promise.resolve(mockResponse(
           200,
           null,
           JSON.stringify({message: message})
        ));
        window.fetch = jest.fn().mockImplementationOnce(() => {
            return fakePromise
        });
        expect.assertions(2); //check if all assertions called
        const info = mount(<Info infoUrl = {url} />);
        await Promise.all([fakePromise]);
        setImmediate(() => {
            try {
                expect(info).toHaveState('message', message);
                expect(info).toIncludeText(message);
            } catch (e) {
                done.fail(e);
            }
            done();
        });
    });