What is Chai and how to use it?
Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework. The chai package is available on npm.
What is Mocha in Node JS?
Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple and fun. 4 done(); // call the done function after test. What is Chai?
What is the difference between Mocha and Chai?
Mocha is a JavaScript testing framework that runs on Node.js, and in the browser. It is one of the most popular test frameworks in use in the Node.js community, and is very easy to learn and understand. Chai is an assertion library that helps extend test frameworks like Mocha to make writing certain kinds of tests easier.
Should you use mocha or Chai for node testing?
Keep in mind that both Mocha and Chai can be used for testing just about any type of Node project, whether it's a library, command-line tool, or even a website. Utilizing the various options and plugins available to you, you should be able to satisfy your testing needs pretty easily.
What is chai JS used for?
Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework.
What is chai used for in testing?
Chai is an assertion library that is often used alongside Mocha. It provides functions and methods that help you compare the output of a certain test with its expected value. Chai provides clean syntax that almost reads like English!
What is difference between Mocha and chai?
Mocha is a JavaScript test framework running on Node. js and in the browser. Mocha allows asynchronous testing, test coverage reports, and use of any assertion library. Chai is a BDD / TDD assertion library for NodeJS and the browser that can be delightfully paired with any javascript testing framework.
How do you use Chai HTTP?
4:3710:3819 - Run Functional Tests on API Endpoints using Chai-HTTPYouTubeStart of suggested clipEnd of suggested clipSo what we need to do is call a method on chai which http provides and the method is called aMoreSo what we need to do is call a method on chai which http provides and the method is called a request so we'll say tried or request. And this allows us to send http requests into express apps.
How do I run a chai test in NodeJS?
Step 1: Create a new directory for your project file using the following command:mkdir Chai.cd Chai npm init -y.{ "name": "chai", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "test": "mocha" }, "keywords": [], "author": "", "license": "ISC", }npm install mocha -g.More items...•
Does postman use chai?
Postman tests can use Chai Assertion Library BDD syntax, which provides options to optimize how readable your tests are to you and your collaborators. In this case, the code uses BDD chains to.have to express the assertion. This test checks the response code returned by the API.
When should I use Mocha?
Mocha is widely used in Node. js. It's focused on various types of tests such as unit, integration, and end-to-end testing. It's been initially designed to support the Node.
Can I use chai with Jest?
Now it is possible to use Jest and Chai together by aliasing the Jest global “expect”: This code can be put in the setupTestFramework script.
Should I use Jest or Mocha?
Jest is also faster than Mocha. It has built-in support for snapshot testing, which means tests are run automatically on each change to the code. This makes it easy to keep your tests up to date as you work. Mocha has more features out of the box since it is a more mature tool with a larger community of contributors.
How do you test API with chai?
0:146:43Testing a REST API with Mocha & Chai - 02 - Install Test DependenciesYouTubeStart of suggested clipEnd of suggested clipWe will need chai http and then finally mocker. So first we're going to install them and we're goingMoreWe will need chai http and then finally mocker. So first we're going to install them and we're going to install them using the save dev whoop flag here that will mark them as def dependencies.
What is postman in Nodejs?
Postman has a powerful runtime based on Node. js that allows you to add dynamic behavior to requests and collections. This allows you to write API tests, build requests that can contain dynamic parameters, pass data between requests, and a lot more.
How do I send a message to Chai?
Navigating the Chai app is fairly simple. You're immediately paired with one of the AI bots and can start chatting right away. Tap the 'Type a message' box to start typing a message, or select one of the suggested emojis above it.
How do you run a chai test?
If you already know how to write Mocha/Chai tests, you can jump forward to to the Automation part.Install Node.js. Copy link. ... Install NPM and Mocha. Copy link. ... Create Hello World with Express framework. Copy link. ... TableMain of Hello World. Copy link. ... Run the app. Copy link. ... Install Mocha and Chai. ... Add a test file. ... Grouping tests.More items...•
Does chai mean?
teaWhat does chai mean? The word “chai” actually is another word for “tea” in Hindi, derived from the word “cha”, the Chinese word for tea. Masala Chai, “spiced tea”, is an ancient form of an Ayurvedic drink dating back 5,000-9,000 years ago.
What is Jasmine framework used for?
Jasmine is an open-source testing framework for JavaScript. It aims to run on any JavaScript-enabled platform, to not intrude on the application nor the IDE, and to have easy-to-read syntax. It is heavily influenced by other unit testing frameworks, such as ScrewUnit, JSSpec, JSpec, and RSpec.
How do you use Mocha unit testing?
0:3715:41Unit Testing with Mocha and Chai [Part 1/2] - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo we can simply write npm install. And then use the save dev flag because we're going to save theseMoreSo we can simply write npm install. And then use the save dev flag because we're going to save these as dev dependencies. And then mocker chai. And nice. So that might take a minute or two to install.
Chai
Chai is an assertion library that provides both the BDD and TDD styles of programming for testing your code in any testing framework.
Mocha
Mocha is a testing framework for Node.js that gives you the flexibility to run asynchronous (or synchronous) code serially. Any uncaught exceptions are shown alongside the test case in which it was thrown, making it easy to identify exactly what failed and why.
Writing Tests
The recommended way to organize your tests within your project is to put all of them in their own /test directory. By default, Mocha checks for unit tests using the globs ./test/*.js and ./test/*.coffee. From there, it will load and execute any file that calls the describe () method.
Running Tests
For the majority of cases, this part is pretty simple. Assuming you've already installed Mocha and navigated to the project directory, most projects just need to use the mocha command with no arguments to run their tests.
Where to Learn More
There is far more to this topic than we can cover in a short blog post, so if you want to learn more then I'd recommend checking out the following resources:
Conclusion
Keep in mind that both Mocha and Chai can be used for testing just about any type of Node project, whether it's a library, command-line tool, or even a website. Utilizing the various options and plugins available to you, you should be able to satisfy your testing needs pretty easily.
Creating a Hello World website with Node.js
Mocha is a relatively fast and straightforward JavaScript test framework hosted on GitHub. It's one of the simplest test suites for Node.js available, and allows for fairly accurate reporting, asynchronous tests, test coverage reports and, most importantly, can use any assertion library. THe best library to pair Mocha with would be Chai.
Configuring unit tests with Mocha and Chai
Every application requires testing before the deployment to the server, especially a welcome site that determines the first impression. In this example we shall use Mocha as the test running framework, and Chai as the assertion library.
Automating Mocha and Chai tests
As we mention in every single guide, all changes to code should be tested for errors. This is what Continuous Integration is all about: making sure that your code is verified and prepared for deployment to production.
What is Node.js?
Node.js is an open-source, cross-platform JavaScript runtime environment used for executing JavaScript code outside of a web browser.
Fundamentals of Node.js
Now that we know what Node.js is, let’s explore the fundamentals of this tool.
Keep the learning going
Learn Node.js without scrubbing through videos or documentation. Educative’s text-based courses are easy to skim and feature live coding environments, making learning quick and efficient.
How to build a basic Node.js project
Let’s learn how to get started with Node.js by creating a simply Node.js file.In this example, we will be setting up our computer to work as a server!
What to learn next
Congrats! You know the basics of Node.js, its fundamental tools, and how to start a Node.js file. The next steps are to master Node.js modules, the HTTP Modules, File system, and NPM dependencies.
What is Mocha?
Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple and fun.
What is Chai?
Chai is a BDD (Behaviour-Driven Development) / TDD (Test-Driven Development) assertion library for nodejs and the browser that can be delightfully paired with any javascript testing framework.
Conclusion
In this article, we have been able to look at setting up testing with Mocha and Chai and also writing tests for our Node API. I would be improving on this article and project to integrate a Continuous Integration tool called Travis-CI.
