1. Introduction

1.1 Tutorial's Goal

This tutorial is designed to guide you through the process of setting up integration tests for HTML projects. Integration tests are vital for ensuring that the different parts of your code work in harmony. We will be using JavaScript and a popular testing framework called Mocha for our tests.

1.2 What You Will Learn

By the end of this tutorial, you will have a solid understanding of:
- What integration tests are
- How to set up Mocha for your HTML project
- How to write and run integration tests
- Best practices when writing integration tests

1.3 Prerequisites

Before starting this tutorial, you should have a basic understanding of HTML, CSS, JavaScript, and the concept of testing in software development.

2. Step-by-Step Guide

2.1 Setting up Mocha

First, we need to set up Mocha in our project. Create a new directory for your project, navigate into it, and initialize it with npm init -y. Then, install Mocha using npm install --save-dev mocha.

2.2 Writing Tests

Next, we will write our tests. In your project directory, create a new file called test.js. In this file, we will write our tests using Mocha's describe and it functions.

2.3 Running Tests

Once we've written our tests, we can run them using the mocha command in our terminal.

3. Code Examples

3.1 Basic Test Example

Below is an example of a basic integration test.

// test.js

// Import the assert module for our tests
var assert = require('assert');

// Describe our test
describe('Array', function() {
  describe('#indexOf()', function() {
    it('should return -1 when the value is not present', function() {
      assert.equal([1, 2, 3].indexOf(4), -1);
    });
  });
});

In the above code:
- describe is a function that takes two arguments: a string description of our test, and a callback function. The callback function contains our actual tests.
- it is another function that takes a string description and a callback function. This callback function is where we write our assertions.

3.2 Running the Test

You can run the test with the mocha command in your terminal. The expected output is:

Array
  #indexOf()
    ✓ should return -1 when the value is not present


1 passing (5ms)

4. Summary

In this tutorial, we've covered the basics of setting up integration tests in HTML projects using Mocha. We've learned how to set up Mocha, write basic tests, and run our tests.

For further learning, I recommend exploring more complex test cases and learning more about Mocha's features. You can find more information in the Mocha documentation.

5. Practice Exercises

1. Write a test that checks whether a number is even or odd.
2. Write a test that checks whether an array is sorted.
3. Write a test that checks whether a string is a palindrome.

Remember to run your tests after writing them to ensure they work as expected. Happy testing!