<!DOCTYPE html>
<html>
<head>
  <style>
    .pills {
      margin-left: 0;
      list-style: none;
      counter-reset: li;
      font-family: "Gill Sans";
    }
    .pills li {
      padding: 10px 0;
      max-width: 300px;
      position: relative;
      left: 1.5em;
      margin-bottom: 0.75em;
      padding-left: 1em;
      background: #E3DEDC;
      transition: background 0.3s ease;
      cursor: pointer;
      border: #d27204;
      text-align: left;
      outline: none;
    }
    .pills li:hover {
      background: #D3CFCF;
    }
    .pills li a {
      display: block;
      text-decoration: none;
      color: inherit;
    }
    .pills li:before {
      padding: 10px 0;
      position: absolute;
      top: 0;
      bottom: 0;
      left: -1.5em;
      width: 1.875em;
      text-align: center;
      color: white;
      font-weight: bold;
      background: #ff8a00;
      border-bottom-left-radius: 70em;
      border-top-left-radius: 70em;
      counter-increment: li;
      content: counter(li);
    }
  </style>
</head>
<body>
<ol class="pills">
  <li><a href="https://codefinity.com/courses/v2/8204075c-f832-4cb9-88b1-4e24e74ebdcb" target='Java Basics'>Java Basics</a></li>
  <li><a href="https://codefinity.com/courses/v2/0bfa1111-8677-478f-bcd3-315dff1d7d40" target='Java Extended'>Java Extended</a></li>
  <li><a href="https://codefinity.com/courses/v2/07aa78fa-7b1d-47f7-825d-309a90d6680a" target='Java OOP'>Java OOP</a></li>
  <li><a href="https://codefinity.com/courses/v2/190d2568-3d25-44d0-832f-da03468004c9" target='Java Data Structures'>Java Data Structures</a></li>

</ol>

</body>
</html>


# Introduction

Welcome to the testing course! You already know **how to write small programs**, but how can you **be sure of the correctness** of these programs? This course will tell you about it, but first, let's start by understanding **what testing means** in programming.

The fundamental principles of testing involve **creating a set of test cases** that cover various aspects of **software functionality, performance, security, and other characteristics**. Testing is conducted at **different levels**, starting from **unit testing of individual components** and ending with **acceptance testing that evaluates the system's compliance** with the customer's stated requirements.

In simpler terms, when **writing a code snippet**, we must **ensure its correctness**. Because if a small piece of code doesn't work correctly, **the entire code may eventually break**.

> Note
>
> You have already encountered testing before when completing tasks on GitHub. I **provided tests for you** to check the correctness of the methods you implemented. Such tests are called **unit tests** and are the most **basic method of testing**. You will learn about them in the second section of this course.

## Conclusion

In conclusion, it can be said that testing is **crucial at any stage** in programming. Instead of stumbling upon pitfalls in the future, it's better to **test everything** right away!

Testing is an integral part of software development. Every module of an application should be covered by tests to ensure the correctness of a specific module or the entire application. This course will teach you about the different types of application testing. Additionally, you will practice with unit tests to test individual components of your application.

Let's talk about types of testing and which testing methods developers use. You will learn about the stages an application goes through before being delivered to the client and the specific tests you will need to write.


In this section, we're going to dive into unit testing — you'll get the rundown on its structure in Java and the ins and outs of crafting them the right way. Setting up your IDE, importing necessary libraries, and lots of hands-on practice.


In this section, we will enhance our coding skills by dealing with errors that can also be caught in unit tests. When testing an application, you may come across various errors, and sometimes they should be turned into exceptions. I will explain how to catch exceptions in your code, test them, and handle them properly.

Java JUnit Library. Types of Testing

What is Testing, and Why do We Need It

Introduction

Conclusion