How to use the gemini-core.ScreenShooter.prototype function in gemini-core

it('should throw if capture fails', () => {
            ScreenShooter.prototype.capture.rejects(new Error('capture fails'));

            return assert.isRejected(capture(), /capture fails/);
        });

it('should capture a screenshot image', async () => {
            const browser = stubBrowser_();
            browser.prepareScreenshot.resolves({foo: 'bar'});

            await browser.publicAPI.assertView();

            assert.calledOnceWith(ScreenShooter.prototype.capture, {foo: 'bar'});
        });

beforeEach(() => {
        sandbox.stub(temp);

        sandbox.spy(ScreenShooter, 'create');
        sandbox.stub(ScreenShooter.prototype, 'capture').resolves();
    });

beforeEach(() => {
        sandbox.stub(Image, 'create').returns(Object.create(Image.prototype));
        sandbox.stub(Image, 'compare').resolves(true);
        sandbox.stub(Image.prototype, 'getSize');

        sandbox.stub(fs, 'readFileSync');
        sandbox.stub(fs, 'existsSync').returns(true);

        sandbox.stub(temp, 'path');
        sandbox.stub(temp, 'attach');

        sandbox.stub(RuntimeConfig, 'getInstance').returns({tempOpts: {}});

        sandbox.spy(ScreenShooter, 'create');
        sandbox.stub(ScreenShooter.prototype, 'capture').resolves(stubImage_());

        sandbox.stub(updateRefs, 'handleNoRefImage').resolves();
        sandbox.stub(updateRefs, 'handleImageDiff').resolves();
    });