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Wrapper to call serverless invokes with mock data, with execution wrapped with promises and tested with mocha
// wire up exec for serverless invokes with mock test data event inputs
const exec = require('child_process').exec
, assert = require('assert')
const stream = require('stream');
const expect = require('chai').expect;
describe('Run serverless invoke tests', function(){
//pass in opts to view stdout / stderr
it('Test dynamo record update event callback from mock json', function(done) {
execp('sls invoke local --function myFunc --path test/data/dynamo_update_event.json').then( (err, stdout, stderr) => {
* Promisified child_process.exec
* @param cmd
* @param opts See child_process.exec node docs
* @param {stream.Writable} opts.stdout If defined, child process stdout will be piped to it.
* @param {stream.Writable} opts.stderr If defined, child process stderr will be piped to it.
* @returns {Promise<{ stdout: string, stderr: stderr }>}
function execp(cmd, opts) {
opts || (opts = {});
return new Promise((resolve, reject) => {
const child = exec(cmd, opts,
(err, stdout, stderr) => err ? reject(err) : resolve({
stdout: stdout,
stderr: stderr
if (opts.stdout) {
if (opts.stderr) {
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