Why testing matters in Swift - See It in Action

Why testing matters

📖 Scenario: Imagine you are building a simple calculator app that adds two numbers. You want to make sure your addition works correctly every time, even if you change your code later.

🎯 Goal: You will create a small program that adds two numbers and then write a test to check if the addition is correct. This shows why testing your code is important.

📋 What You'll Learn

Create two variables with exact values

Create a variable to hold the sum

Write a simple test using an if statement to check the sum

Print the test result exactly as specified

💡 Why This Matters

🌍 Real World

Testing is used in all software projects to make sure programs work correctly before people use them.

💼 Career

Knowing how to write tests is important for software developers to deliver reliable and bug-free applications.

1

Create two number variables

Create two variables called number1 and number2 with values 5 and 7 respectively.

Swift

# Your code here
// Create number1 and number2 variables

Need a hint?

Use let to create constants for the numbers.

2

Add the two numbers

Create a variable called sum that adds number1 and number2.

Swift

let number1 = 5
let number2 = 7
// Your code here
// Create sum variable by adding number1 and number2

Need a hint?

Use the + operator to add the two numbers.

3

Write a test to check the sum

Write an if statement that checks if sum equals 12. Inside the if, create a variable called testResult and set it to "Test passed". Otherwise, set testResult to "Test failed".

Swift

let number1 = 5
let number2 = 7
let sum = number1 + number2
// Your code here
// Write if statement to check sum and set testResult

Need a hint?

Use if sum == 12 to compare and set testResult accordingly.

4

Print the test result

Write a print statement to display the value of testResult.

Swift

let number1 = 5
let number2 = 7
let sum = number1 + number2
var testResult: String
if sum == 12 {
    testResult = "Test passed"
} else {
    testResult = "Test failed"
}
// Your code here
// Print the testResult

Need a hint?

Use print(testResult) to show the test result.