Guide: Unit Testing

Unit Testing: An Introduction
Unit Testing is a level of Software Testing where individual units/components of a software are tested. The purpose is to validate that each unit of the software performs as designed and intended.

Importance of Unit Testing
Unit Testing is important because it helps discover issues early in the development cycle, not only making it easier to fix but also reducing project costs. It improves the design of the code, allows easier changes and upgrades, and ensures that the rest of the codebase remains unaffected by modifications.

How Unit Testing Works
Unit Testing works by using a Unit Test Framework to write and run tests. This involves writing test cases for every function and method. The tester then compares the output of each test case with the expected output. If they match, the test case is deemed to have passed.

Exam Tips: Answering Questions on Unit Testing
1. Understand the concept: Make sure you have a complete understanding of Unit Testing, its purpose and how it works.
2. Practice examples: Run several examples of Unit Testing to get a feel for how it's implemented.
3. Review questions and sample answers: Familiarize yourself with past question papers and their solutions. Understanding the marking criteria is crucial to passing the exam.
4. Use positive language: Remember that the pass mark may not be 100%. Acknowledge the uses and benefits of this type of testing in your answers
The best tip to remember here is that you should always put into practice the concepts you learn in theory. This can significantly help in your understanding of any topic, and certainly applies to Unit Testing.