Using Test Cases to Find Bugs: A Practical Guide for Grade 6

📚 Quick Study Guide

• 🔍 What are Test Cases? Test cases are like mini-experiments you design to check if your code is working correctly. Think of them as detectives, sniffing out errors!
• 💡 Why use Test Cases? They help you find bugs (errors) early, before they cause big problems later. Finding bugs early saves time and makes your code more reliable.
• 📝 Parts of a Test Case: Each test case usually includes:
• Input: What you give to your code.
• Expected Output: What you expect your code to produce.
• Actual Output: What your code actually produces.
• Comparison: Check if the Actual Output matches the Expected Output. If they match, your test case passes! If they don't, you've found a bug!
• 🛠️ Example: Imagine you have a program that adds two numbers. A test case could be:
  • Input: 2 + 3
  • Expected Output: 5
  • If your program gives 5, the test case passes. If it gives something else (like 6), you've found a bug!
• ✅ Benefits: Test cases make sure your program works as you intended and that it *keeps* working as you add more code.

Practice Quiz

1. Which of the following BEST describes what a test case is?
   1. A) A type of computer virus.
   2. B) A set of instructions for the computer.
   3. C) A mini-experiment to check if your code works.
   4. D) A way to make your code run faster.
2. What is the main purpose of using test cases?
   1. A) To make the code look nicer.
   2. B) To find bugs in the code.
   3. C) To confuse the programmer.
   4. D) To make the code longer.
3. What are the three key components of a good test case?
   1. A) Input, Output, and Colors.
   2. B) Input, Expected Output, and Actual Output.
   3. C) Input, Comments, and Variables.
   4. D) Output, Variables, and Comments.
4. If the Actual Output of a test case does NOT match the Expected Output, what does that mean?
   1. A) The test case is broken.
   2. B) The code is working perfectly.
   3. C) A bug has been found in the code.
   4. D) The computer needs to be restarted.
5. Why is it important to find bugs early in the coding process?
   1. A) Because it's fun to find bugs.
   2. B) Because it saves time and makes the code more reliable.
   3. C) Because bugs make the code look more interesting.
   4. D) It's not important; bugs don't matter.
6. Imagine you have a program that subtracts two numbers. If the input is 5 - 2, what is the EXPECTED output?
   1. A) 2
   2. B) 3
   3. C) 5
   4. D) 7
7. What is a benefit of consistently using test cases while programming?
   1. A) Makes your code more confusing.
   2. B) It ensures your program works as intended and keeps working as you add more code.
   3. C) It slows down the programming process.
   4. D) Test cases have no real benefits.