> For the complete documentation index, see [llms.txt](https://shoppinpal.gitbook.io/docs-shoppinpal-com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://shoppinpal.gitbook.io/docs-shoppinpal-com/5.-the-frontend/unit-testing.md). # Unit Testing [TDD](https://blog.risingstack.com/getting-node-js-testing-and-tdd-right-node-js-at-scale/) is an essential part of any software development cycle. Here's a story from my past which relates its importance: > I created a filter module for products just like amazon or flipkart have. I tested it well on my machine and it was working great. Then came the day of live demo to our client, where this filter suddenly stopped working! It was doing nothing in our staging env and it was kind of embarrassing. The next day, I decided to create unit tests for each every function that I wrote. As developer we should feel confident in our code's ability to run well, therefore, we must learn to love the feeling of having a watertight app that comes with automated testing. Apart from my stories let us start a real example. You can follow [AngularUnitTestDemo](https://github.com/Mohammed-Aadil/AngularUnitTestDemo) on github or clone a local copy to begin with. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://shoppinpal.gitbook.io/docs-shoppinpal-com/5.-the-frontend/unit-testing.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.