Node.js mocha test spec to check for Event Store in-flight events

EventStoreInFlightEvents.js

let request = require('supertest');
let assert = require('chai').assert;

let apiBaseUri = request("http://your.event.store.url:port.number");

describe('Ensure no in-Flight events in the Event Store', function () {

    let subscriptionsEndpoint = '/subscriptions';

    it(' Verify the total number of in-flight messages = 0', (done) => {
        let maxRetryCount = 5;
        let pollingInterval = 5000;
        checkInFlightMessagesList(maxRetryCount, pollingInterval).then(() => {
            done();
        }).catch(done);
    });

    function checkInFlightMessagesList(maxRetryCount, pollingInterval) {
        let totalInFlightMessagesList;
        console.log(`Retries remaining = ${maxRetryCount}`);
        return apiBaseUri.get(subscriptionsEndpoint)
            .auth('eventStoreUsername', 'eventStorePassword')
            .set('Accept', 'application/json')
            .expect('Content-Type', /json/)
            .expect(200)
            .then(apiResponse => {
                totalInFlightMessagesList = JSON.parse(apiResponse.text)
                    .map(item => item.totalInFlightMessages);
                console.log(`Event Store ${subscriptionsEndpoint} API response: ${apiResponse.text}`);
                for (let index = 0; index < totalInFlightMessagesList.length; index++) {
                    let totalInFlightMessages = totalInFlightMessagesList[index];
                    if (totalInFlightMessages > 0 && maxRetryCount > 0) {
                        console.log(`Waiting for ${pollingInterval} ms`);
                        return new Promise(resolve => setTimeout(resolve, pollingInterval))
                            .then(() => checkInFlightMessagesList(maxRetryCount - 1, pollingInterval));
                    } else if (index === totalInFlightMessagesList.length - 1 && maxRetryCount > 0) {
                        console.log("No events are present in the in-flight queue.");
                    } else if (maxRetryCount === 0) {
                        assert.fail('Max retries exceeded; one or more events are present in the in-flight queue!');
                    }
                }
            });
    }
});