Test timers lambda

lambda.js

var lastRun = new Date();
var numFailed = 0;
var numUpdatedTime = 0;
var numChecked = 0;
var numFatalFailures = 0;

setInterval(() => {
    numUpdatedTime++;
    console.log('---------- Update time', new Date().toJSON());
    lastRun = new Date();
}, 5000);

setInterval(() => {
    numChecked++;
    if (new Date() - lastRun > 5000) {
        console.log('        check failed', new Date().toJSON());
        numFailed ++;
    } else {
        console.log('        check passed', new Date().toJSON());
        numFailed = 0;
    }
    if (numFailed >= 5) {
        numFatalFailures++;
    }
}, 200);

exports.handler = async (event) => {
    const response = {
        numChecked,
        numUpdatedTime,
        numFailed, 
        numFatalFailures,
    };
    return JSON.stringify(response);
};