Setting up a testing framework in Node.js – An underlying introduction for novices
What is its relevance?
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Undeniably, the necessity of testing can’t be overstated – without it, bugs run rampant, making it more challenging and costly to fix them. Automated testing can significantly enhance test coverage and decrease long-term costs.
Some teams entrust this task to developers, while others might assign it to testers for developing automated tests. These auto tests could be unit tests (short tests aimed at small segments of functionality) or more extensive, integration-level tests.
Nonetheless, the chore of pinpointing and integrating tools for automated testing within a Node.js setup can be daunting.
This article gives a succinct review of several favored tools, offering an insight into how these tools could be amalgamated to build a comprehensive test environment.
What Frameworks Should I Consider?
With various testing tools and frameworks available (and newer ones being developed), we’ve played around with numerous ones to distill this compendium of the best in testing tools.
Mocha is a remarkable testing framework that supports promises along with asynchronous/await features using TypeScript or Babel. Mocha coordinates the execution of the tests you develop, grabs any assertion errors, and offers clear console output.
Chai is an assertion library that allows you to utilize natural language constructs while crafting your tests. This capability is highly valuable as many libraries for assertion can be fairly obscure.
Here’s a sample demonstrating how natural language assertions can be drafted with Chai:
Mockery is a compact npm module that permits the swapping of test mocks without altering your live code in any manner. By merely creating a mock function or module and registering it with mockery, Node.js will switch to your mocks whenever a requisite statement is used in your code.
Jenkins is an integrated system for continuous deployment syncing seamlessly with your version control (such as git) and auto triggers Mocha each time a commit happens. This ensures your product is tested every time a modification is made.
How to Configure a Testing Framework in Node.js?
Step #1: Incorporate Mocha, Chai, and Mockery as dependencies into your project.
Step #2: Modify your package.json file to incorporate a script for testing.
Step #3: Develop some tests.
(Click the image for a detailed view)
Step #4: Start your tests by entering ‘npm run test’ in the command prompt.
Where can I obtain more resources?
As manifested, Mocha and Chai proffer an excellent testing journey with minor obstacles to entry.
In the ensuing article, we will illustrate how to employ Mockery, compose asynchronous tests using Mocha, and elaborate on setting up all these components using Jenkins.
To play around with our sample code, do visit GitHub.
Suggested reading => Configuration of Consumer Pact Test
Though the market is saturated with a plethora of testing tools and frameworks, this article offers a terse guide to setting up the Node.js framework.
Additional reading =>> Node.js Interview Questions and Responses Frequently Raised
About the Author: Dave Beck has an M.S. in Computer Science and devotes an inordinate amount of time to software engineering. Moreover, he never misses a chance to wakeboard or weightlift during his leisure hours. You can connect with him at wakecoder.com or github.com/wakecoder.
Further reading =>> D3.js Tutorial for Novices
We welcome your comments, queries, and experiences below.