Explicit Waits

        it('loads existing invitations', async function() {
            // Instead of looking for a particular invitee list item, let's find the
            // whole invited list and ensure it contains the name of the invitee
            // we're looking for. This element should get found as soon as the page
            // loads, because it's present even before the AJAX request completes.
            let list = await driver.findElement(page.locators.invitedList);
            // Now we need to wait for that AJAX call. We'll do that with an explicit
            // wait. We make a call to the driver.wait() method.
            // We need to give the wait() method the conditions that will cause it
            // to stop waiting. Remember, up at the top of this file, we require
            // the "until" object. That object has a method called elementLocated()
            // that will stop the wait as soon as the specified locator is present
            // in the document. So we'll have it look for our "invitees" locator,
            // which will only be present after the AJAX request completes successfully.
            await driver.wait(
                until.elementLocated(page.locators.invitees)
            );
            // Once the explicit wait is resolved, we can be confident our invitees
            // have been loaded into the page. If we get all the text from our list
            // element, it should include the name of the invitee we're looking for.
            let text = await list.getText();
            // We end our test by asserting that the text includes the name.
            assert(text.includes("Craig Dennis"));
        });