Summary  
This chapter explains how a versatile programming language can be used to implement different automated testing techniques—such as unit tests, integration tests, browser-based end-to-end tests, API calls, database verification, and performance testing—using JavaScript.

General domain of usage  
Web application testing

The concepts of **Automation Testing** are mostly transferable across different programming languages, with the difference mainly being in the libraries or frameworks being used, and the syntax. 

Since it is impossible to cover all of the programming languages in one course, we will explore the concepts of **Automation Testing** using **JavaScript** as our main language. **JavaScript** is an ideal choice because it is the most popular language for web development, hence covering a wide range of applications.

Additionally, in this course, a web application built using **JavaScript** will be used for practicing the **Automation Testing** concepts. This application will be introduced in the next chapter. Since our subject application is based on **JavaScript**, therefore, it is imperative for us to utilize JavaScript for application testing.

**JavaScript** is a very popular language, moreover it is highly versatile, providing us with many tools for testing. Using JavaScript we can:

- Write **Unit Tests** to test functions, classes or modules;
- Write **Integration Tests** to verify proper interaction of different components;
- **Automate a browser** to perform certain tests and verify the results; **Browser Automation** is most common for the purpose of **End-To-End (E2E)** and some **Integration Tests**;
- Make **HTTP requests** to test the functionality of an **API**;
- Verify the structure of a database;
- Use tools like **K6** to stress or performance test the application;

JavaScript serves as an all-in-one tool for **Automation Testing**. We will learn about each of the above-mentioned types of testing in the upcoming chapters and sections.

For what purpose is Browser Automation most commonly used in Automation Testing?

Build on top of your previously acquired Manual Testing knowledge and learn Automation Testing using Node.JS and Jest. This course will also introduce you to some additional libraries and tools like Selenium, Axios and Jenkins.

In this section, we will get an introduction to automation testing, both conceptually and practically. The application which we will be working on throughout this course will be briefly explored in order to familiarize ourselves with the work environment, and set the momentum for the rest of the course.

In this section, we will learn what Test Automation Frameworks are, why they are necessary, and how to use them. Most programming languages have Test Automation Frameworks, however, we will be using JavaScript to learn about one of the popular JavaScript Test Automation Framework known as Jest. Most of the concepts explored in this section will be transferable to other programming languages and frameworks.

In this section, we will learn how to perform more complicated tests in an automated manner, by automating the browser. This includes, automating user operations like visiting the website, inputting data into the fields and interacting with elements.

In this section, we will briefly explore some intermediate Automation Testing concepts like API testing using Jest and Axios, and setting up a CD/CI pipeline to streamline the whole testing process.

JavaScript in Automation Testing

Awesome!

JavaScript in Automation Testing