Jest testing framework: check the properties exists on response

Here is my http post call

app.post('/sample', (req, res) => {
    res.status(200).send({
        x:1,y:2
    });
})

I would like to test the response contains the properties and x and y

Here is the test code but it checks only the response ok or not.

describe('Test the post path', () => {
    test('It should response the POST method', () => {
        return request(app).post('/sample').expect(200);
    });
})

I think this method expect.objectContaining(object) fulfill my needs but don't know how to use in my scenario