Error Guessing Guide

1. Introduction

Goal of the Tutorial

This tutorial aims to provide a comprehensive guide on how to use Error Guessing in your HTML development process.

What You Will Learn

By the end of this tutorial, you will be able to:
- Understand what Error Guessing is
- Implement Error Guessing in your HTML development
- Write test cases to identify error-prone areas in your code

Prerequisites

Basic knowledge of HTML and a general understanding of testing techniques are necessary to follow this tutorial.

2. Step-by-Step Guide

Explanation of Concepts

Error Guessing is a testing technique where you try to identify the most error-prone areas of your system and create test cases for those areas. These error-prone areas could be identified based on past experiences or intuition.

Examples with Comments

Suppose you are creating a user registration form in HTML. You know that one common error is users not correctly inputting their email addresses. Hence, you could create a test case where you input an invalid email address to see if the system catches it.

Best Practices and Tips

• Always document your test cases for future reference.
• Update your test cases as your system evolves.
• Use your past experiences and learn from mistakes to identify error-prone areas.

3. Code Examples

Example 1:

Testing a form field for number inputs only.

<!-- The HTML form field for number input -->
<input type="text" id="age">

<script>
    // Get the input field
    var input = document.getElementById("age");

    // Function to validate the input
    function validateNumberInput() {
        var value = input.value;
        // If value is not a number, show an alert
        if (isNaN(value)) {
            alert("Invalid input. Please enter a number.");
        }
    }

    validateNumberInput();
</script>

In the above code, we are guessing that the user might enter a non-number input for the age field, which is an error. Hence, we write a function to validate the input and show an alert if the input is not a number.

Example 2:

Testing a form field for valid email inputs.

<!-- The HTML form field for email input -->
<input type="text" id="email">

<script>
    // Get the input field
    var input = document.getElementById("email");

    // Function to validate the input
    function validateEmailInput() {
        var value = input.value;
        // If value is not a valid email, show an alert
        if (!value.includes("@")) {
            alert("Invalid input. Please enter a valid email.");
        }
    }

    validateEmailInput();
</script>

In this example, we are guessing that the user might not enter a valid email address, so we validate the input and show an alert if it's not valid.

4. Summary

In this tutorial, we learned about Error Guessing, a testing technique used to identify error-prone areas in the system and write test cases for those areas. We also saw how to implement Error Guessing in HTML development with a couple of examples.

For further learning, you can look into more advanced testing techniques and tools, such as unit testing and integration testing.

5. Practice Exercises

Exercise 1:

Create a form with a password field. Write a script to validate that the password is at least 8 characters long.

Exercise 2:

Extend the script from Exercise 1 to also validate that the password contains at least one number and one special character.

Exercise 3:

Create a form with a date field. Write a script to validate that the date entered is not a future date.

For solutions and further practice, refer to various online resources and practice platforms, such as Codecademy, freeCodeCamp, or W3Schools.