testdouble.js | A minimal test double library for TDD with JavaScript | Unit Testing library

by testdouble JavaScript Version: v3.18.0 License: MIT

X-Ray Key Features Code Snippets(1)Community Discussions(3)Vulnerabilities Install Support

kandi X-RAY | testdouble.js Summary

testdouble.js is a JavaScript library typically used in Testing, Unit Testing, Jest applications. testdouble.js has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can install using 'npm i testdouble' or download it from GitHub, npm.

Welcome! Are you writing JavaScript tests and in the market for a mocking library to fake out real things for you? testdouble.js is an opinionated, carefully-designed test double library maintained by, oddly enough, a software agency that's also named Test Double. (The term "test double" was coined by Gerard Meszaros in his book xUnit Test Patterns.). If you practice test-driven development, testdouble.js was designed to promote terse, clear, and easy-to-understand tests. There's an awful lot to cover, so please take some time and enjoy our documentation, which is designed to show you how to make the most out of test doubles in your tests. This library was designed to work for both Node.js and browser interpeters. It's also test-framework agnostic, so you can plop it into a codebase using Jasmine, Mocha, Tape, Jest, or our own teenytest.

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Support

testdouble.js has a medium active ecosystem.

It has 1390 star(s) with 151 fork(s). There are 21 watchers for this library.

It had no major release in the last 6 months.

There are 47 open issues and 264 have been closed. On average issues are closed in 50 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of testdouble.js is v3.18.0

Quality

testdouble.js has 0 bugs and 0 code smells.

Security

testdouble.js has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

testdouble.js code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

testdouble.js is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

testdouble.js releases are not available. You will need to build from source code and install.

Deployable package is available in npm.

Installation instructions, examples and code snippets are available.

Top functions reviewed by kandi - BETA

kandi has reviewed testdouble.js and discovered the below as its top functions. This is intended to give you an instant insight into testdouble.js implemented functionality, and help decide if they suit your requirements.

Require a module
Gets a reference to the real world .

Get all kandi verified functions for this library.

testdouble.js Key Features

No Key Features are available at this moment for testdouble.js.

testdouble.js Examples and Code Snippets

How to stub mysql query using some mock data and mocha in node js

JavaScript

Lines of Code : 37

License : Strong Copyleft (CC BY-SA 4.0)

Copy

const sequelize = require('sequelize')

// ...

exports.doSomething = async function () {
  await sequelize.query("select * from `" + table_name + "` where email='" + data.user + "' and name = '" + name + "' " + pre_name + ";", {
    type:

Community Discussions

Trending Discussions on testdouble.js

Mocking third party library (ioredis) in typescript tests

How to properly stub a function return value?

Replacing dependencies in AMD module format with testdouble.js

QUESTION

Mocking third party library (ioredis) in typescript tests

Asked 2020-May-19 at 22:24

I am having a surprisingly hard time being able to mock a third party library in my typescript tests.

I am making a library based upon this typescript-starter library. It uses ava for testing.

In my case I am trying to mock the main class of ioredis so that my tests does not try to set up real database connections.

I have tried to use sinon, testdouble.js, and mockery.

In sinon I have tried the following

...

ANSWER

Answered 2018-Jan-17 at 08:24

I had a couple of misunderstandings / issues with my code which caused this. Perhaps this can enlighten someone else stumbling upon this;

I was requiring "everything" (import { MyLibrary } from "myLibrary") before the td.replace which made the replace statement happen after the code had required the module. The reason was that the example test were designed a specific way in typescript-starter repo. I have now made a PR to fix the underlying problem.
I was running the ava tests in parallel, which caused the td.reset() to happen before some of my callbacks had fired, effectively preventing the replace to work in many cases. The solution in ava, use test.serial(... in stead of test(.... Yes, the test will run slower, but they will work. You can make a separate file for each test to get true parallel runs in ava.

There are also some useful wiki entries in the testdouble GitHub page; https://github.com/testdouble/contributing-tests/wiki/Don%27t-mock-what-you-don%27t-own https://github.com/testdouble/contributing-tests/wiki/SAFE-test

Hope someone finds this useful.

Source https://stackoverflow.com/questions/48188855

QUESTION

How to properly stub a function return value?

Asked 2017-Nov-15 at 18:59

Premise: JS ES6, NodeJS
Testing Framework: TAP
Mocking Library: testdouble.js

I am attempting to mock the return value for the method of my class and keep receiving this error:

not ok Unsatisfied verification on test double. Wanted: - called with (true). But there were no invocations of the test double.

Here is my testing code:

...

ANSWER

Answered 2017-Nov-15 at 18:04

It's a little hard to tell from your example, but it looks like you're requiring iTunesClient before you call td.replace. In this case, the real reqJson module will be required and cached on line 3.

You need to call td.replace early enough to avoid this, e.g. in between requiring tap and iTunesClient.

Source https://stackoverflow.com/questions/46613079

QUESTION

Replacing dependencies in AMD module format with testdouble.js

Asked 2017-Apr-29 at 16:04

I'm writing tests for a JS application using Jasmine and testdouble.js as a mocking library. I am using AMD format to organize code in modules, and RequreJS as a module loader. I was wondering how to use testdouble.js to replace dependency for the module being tested that is in AMD format and it is loading via RequireJS. The documentation is unclear about this or I am missing something, so if someone could point me in the right direction.

I'll post the example bellow that illustrates my setup and the problem that I am facing.

car.js

...

ANSWER

Answered 2017-Apr-29 at 16:04

testdouble.js does not have any explicit support for AMD modules. The only module-related tricks it offers are Node.js specific and built on top of Node's CJS module loader.

What you would need to do in this case is require from the test a reference to engine and replace the run property, which it seems like you've done (your example is incomplete).

If you do this, don't forget to run td.reset() in an afterEach to restore the original properties to anything you replace!

Source https://stackoverflow.com/questions/42071572

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install testdouble.js

If you just want to fetch the browser distribution, you can also curl it from unpkg.
testdouble-jest
testdouble-chai
testdouble-jasmine
testdouble-qunit
Mocking libraries are more often abused than used effectively, so figuring out how to document a mocking library so as to only encourage healthy uses has proven to be a real challenge. Here are a few paths we've prepared for getting started with testdouble.js:. Of course, if you're unsure of how to approach writing an isolated test with testdouble.js, we welcome you to open an issue on GitHub to ask a question.
The API section of this README so you can get started stubbing and verifying right away
A 20-minute video overview of the library, its goals, and basic usage
A comparison between testdouble.js and Sinon.js, in case you've already got experience working with Sinon and you're looking for a high-level overview of how they differ
The full testdouble.js documentation, which describes at length how to (and how not to) take advantage of the various features of testdouble.js. Its outline is in docs/README.md

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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