mafalda-api/database/db.test.js

var database = require("./db.js");
database.init();

database.put('naaa', {username: "nik"}).
then(() => database.put('asdad2', {username: "nik2"})).
then(() => database.put('asdad3', {username: "nik3"})).
then(() => database.put('asdad4', {username: "nik4"})).
then(() => database.put('asdad5', {username: "nik5"})).then(function(value){
	return database.get('dasnaaa').catch((e)=>console.log(e.name === "NotFoundError"));
}).then(console.log).
then(() => {
	let a = database.index.createSearchStream(['username', 'nik']).on('data', (a) => console.log(a));
})
.catch(console.log);