testdouble.js | A minimal test double library for TDD with JavaScript | Unit Testing library
kandi X-RAY | testdouble.js Summary
kandi X-RAY | testdouble.js Summary
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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Top functions reviewed by kandi - BETA
- Require a module
- Gets a reference to the real world .
testdouble.js Key Features
testdouble.js Examples and Code Snippets
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
QUESTION
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 08:24I 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 thetd.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 thereplace
to work in many cases. The solution in ava, usetest.serial(...
in stead oftest(...
. 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.
QUESTION
- 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 18:04It'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
.
QUESTION
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 16:04testdouble.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!
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install testdouble.js
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
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