Regression Testing Basics

Tutorial 3 of 5

Regression Testing Basics

1. Introduction

This tutorial aims to provide a comprehensive understanding of Regression Testing and how it is employed in the world of web development. By the end of this guide, you will be able to understand the basics of Regression Testing and apply it in HTML.

You will learn:
- The significance of Regression Testing.
- Conducting Regression Testing in HTML.

Prerequisites:
- Basic knowledge of HTML.
- Familiarity with JavaScript.

2. Step-by-Step Guide

Regression Testing is a type of software testing that ensures that previously working functionalities continue to work after changes such as enhancements, patches, configuration changes, etc. have been made. It ensures that older programming still works with the new changes.

Best practices and tips:

Always perform Regression Testing after a change has been made in the system.
Automating the Regression Testing process can save a lot of time.
Regularly update and review your test cases.

3. Code Examples

Suppose we have a simple HTML page with a button that changes the text of a paragraph when clicked.

Example 1:

<!DOCTYPE html>
<html>
<body>

<h2>My First Web Page</h2>

<p>Click "Try it" to change the text in the paragraph.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo">Hello World!</p>

<script>
function myFunction() {
  document.getElementById("demo").innerHTML = "Hello JavaScript!";
}
</script>

</body>
</html>

In this example, the JavaScript function changes the text in the paragraph from "Hello World!" to "Hello JavaScript!" when the button is clicked. If there's a change made to this function, Regression Testing will ensure it still performs its intended function.

Expected result: The paragraph's text should change to "Hello JavaScript!" when the button is clicked.

4. Summary

In this tutorial, we have covered the basics of Regression Testing and how it can be applied to HTML. The key points were:

Understanding the essence and importance of Regression Testing.
Applying Regression Testing in web development.

For further learning, you can explore automated Regression Testing with JavaScript testing frameworks like Mocha or Jest.

5. Practice Exercises

Exercise 1:

Create an HTML page with two buttons. One button should change the color of a paragraph to red, and the other should change it to blue. Apply regression testing after making changes to the JavaScript functions.

Solution:

<!DOCTYPE html>
<html>
<body>

<h2>My First Web Page</h2>

<p>Click the buttons to change the color of the paragraph.</p>

<button onclick="changeToRed()">Red</button>
<button onclick="changeToBlue()">Blue</button>

<p id="demo">Hello World!</p>

<script>
function changeToRed() {
  document.getElementById("demo").style.color = "red";
}

function changeToBlue() {
  document.getElementById("demo").style.color = "blue";
}
</script>

</body>
</html>

Expected result: The color of the text in the paragraph should change to red when the 'Red' button is clicked and to blue when the 'Blue' button is clicked.

Exercise 2:

Create an HTML page with a button that hides a paragraph when clicked. After making changes to the JavaScript function, apply regression testing.

Remember to keep practicing and exploring more about Regression Testing and its application in web development. Happy coding!