How to mock a function in JEST?

[Sudhir Goswami]

I am trying to mock a function. below my code snippet

FileName : logging.js

 function trackEvent(event, user, object, objectId, extraProperties) {
    if (client !== null) {
        let properties = extraProperties || {};
        properties['user'] = user;
        properties['object_type'] = object;
        properties['object_id'] = objectId;
        client.trackEvent({ name: event, properties: properties });
    }
}

I created one test.js file and imported the my function like
const Logging = require('../Logging.js');
Please help me how to mock "trackEvent()" Function using JEST. As trackEvent() is not returning any value, Can it be verified by some mock function to be called once?

Thanks
Sudhir