0.1.4 • Public • Published


Mïonendas is an API testing tool.


npm install mionendas @babel/runtime --save-dev

Usage and Example

After installation, there are 6 main steps to using Mïonendas:

1. In your project, create a file called mionfile.js.

2. In mionfile.js, add require()'s for Mïonendas' exports (or Mïonendas as a whole, if you wish).

var Tester = require('Mionendas').Tester;
var Suite = require('Mionendas').Suite;
var when = require('Mionendas').when;
var match = require('Mionendas').match;
// Use `Tester` as just `Tester`

// - - - OR - - -

var Mionendas = require('Mionendas');
// Use `Tester` as `Mionendas.Tester`

3. In mionfile.js, extend Mionendas.Tester to create your own testing class, and export it:

class MyTester extends Tester {

  constructor(env) {

  declareSuites() {



module.exports = MyTester;

4. In mionfile.js, write your Suites inside your class's declareSuites() function. Each suite should correspond to a different API endpoint, and may contain multiple tests.

declareSuites() {
  return ([

    new Suite('post', '/article', () => {

      const schema = {
        article_id: 'string',

      return ([
        when('given an invalid author')
        .with(() => ({
          title: 'This is my article’s title',
          content: 'This is my article’s content.',
          author: null,
        .check((result) => {
          if (result === 'invalid_author') {
            return true;
          return false;

        when('given valid article data')
        .with(() => ({
          title: 'This is my article’s title',
          content: 'This is my article’s content.',
          author: 'Bob Ross',
        .check((result) => {
          if (match(result, schema)) {
            return true;
          return false;



5. In a gulp task (or node script, etc.), import mionfile.js. Instantiate your tester with an environment object, and call run():

var gulp = require('gulp');
var MyTester = require('./mionfile');

gulp.task('test', () => {
  return new MyTester({
    host: '',
    path_root: '/',
    port: 8000,

6. Run your gulp task (or node script, etc.).

gulp test



Extend this class to create your own tester class. Your tester class must have:

  • A constructor() that takes a single argument, and calls super() with that argument. See step 3 in "Usage and Example" for an example.

  • A declareSuites() that returns an array of Suites. See step 4 in "Usage and Example" for an example.

When instantiating your tester class, pass it an object with environment properties. This object will accept the following keys:

  • host String required

    The host name of your API.

  • path_root String required

    The path to your API's root. Can be an empty string.

  • port Number optional

    Your API's port.

To run your tester class, instantiate it, and call run() on the instance. See step 5 in "Usage and Example" for an example.

new Suite(method, route, testBuilder)

Creates a new Mïonendas Suite. Each Suite should correspond to one of your API's endpoints. An array of these should be returned in your tester class's declareSuites() function.


method String required

The HTTP method for this Suite's endpoint, e.g. 'get', 'post', etc.

route String required

The route string for this Suite's endpoint. It should always start with a '/'.

This string will be split by '/' into route_pieces. Any route_piece that starts with ':' will be considered a route_parameter. Every test that is returned by this Suite's testBuilder() will need to provide a value for any route_parameters that exist. For example:

// This suite has one route parameter called `article_id`. Each test returned by
// `articleSuiteBuilder` will need to include a value for `article_id`.
new Suite('get', '/articles/:article_id', articleSuiteBuilder);
testBuilder Function required

This function takes no arguments, and must return an array of Tests.


Creates a new Mïonendas Test. An array of these should be returned by the testBuilder() of each Suite. Must be chained with a subsequent call to with(). See step 4 of "Usage and Example" for an example.


description String required

The description for this test. The convention is to start the description with the word "given", e.g. 'given an invalid author_id', so that when the word 'when' is prepended to the description, a valid prepositional phrase is formed.


Defines the data to pass to a Mïonendas Test. Must be chained onto a when(), and must be chained with a subsequent call to check(). See step 4 of "Usage and Example" for an example.


dataGetter Function required

A function that takes no arguments, and returns an object. This object describes the data sent to the API endpoint being tested, and can have the following keys:

  • body any

    The body of the HTTP call to the API endpoint. Used with every HTTP method except for GET.

  • params Object

    Each key in this object should correspond to a route_parameter in the Suite's route, and should be a string.

  • query Object

    This object is serialized into a URL query string, e.g. ?author_id=94&year=2014. Used only on GET HTTP calls.

  • token String

    This string is set as the HTTP call's Authorization Bearer header.


Validates the result of the Mïonendas Test's API call. Must be chained onto a with(). See step 4 of "Usage and Example" for an example.


checker Function required

A function that takes the result of the Tests API call as its one argument, and must return a Boolean. This is where you put your logic to determine if the API endpoint you're testing has passed this particular test or not. match() can be used here.

match(subject, target)

Used within check() to determine if the result of an API call matches a particular schema.


subject Object required

This is either the result of the your Test's API call, or a part of it.

target Object required

The target schema that you want to check if subject matches.

Each key in target corresponds to a key in subject.

Each value in target can be one of:

  • 'string'
  • 'number'
  • 'boolean'
  • 'array'
  • 'object'
  • 'datestring'
  • 'null'

A value can also be an array where each item is one of the above values.

A value can also be appended with a '?', as a shorthand for a 2-element array containing value and 'null'. For example:

// Both `name` and `author` be can either a string value or `null`.
const target = {
  name: 'string?',
  author: ['string', 'null'],

A value of 'datestring' will match any string that, when passed to new Date(), results in a valid Date object. For example:

const valid_subject = {
  date_created: '2014-05-14T11:00:00Z',

const invalid_subject = {
  date_created: 'meow',

const target = {
  date_created: 'datestring',

match(valid_subject,   target); // true
match(invalid_subject, target); // false

To examine a sub-object within the result of your API call, call match() twice with two different target values, one corresponding to the result as a whole, and one corresponding to the sub-object in that result. For example:

const subject = {
  name: 'United States of America',
  national_anthem: {
    title: 'The Star-Spangled Banner',
    author: 'Francis Scott Key',
    year_written: 1814,

const target = {
  result: {
    name: 'string',
    national_anthem: 'object',
  national_anthem: {
    title: 'string',
    author: 'string',
    year_written: 'number',

  match(subject, target.result) &&
  match(subject.national_anthem, target.national_anthem)
) // true


A Boolean:

  • true if the subject matches the target exactly, and

  • false if not.



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