unleash.unleash/lib/metrics.test.js

'use strict';

const test = require('ava');
const { EventEmitter } = require('events');
const eventBus = new EventEmitter();
const { REQUEST_TIME } = require('./events');
const { startMonitoring } = require('./metrics');
const prometheusRegister = require('prom-client/lib/register');

test('should collect metrics for requests', t => {
    startMonitoring(true, eventBus);
    eventBus.emit(REQUEST_TIME, { path: 'somePath', method: 'GET', statusCode: 200, time: 1337 });

    const metrics = prometheusRegister.metrics();
    t.regex(metrics, /http_request_duration_milliseconds{quantile="0.99",status="200",method="GET",path="somePath"} 1337/);
});