Test-driven development (TDD) in Software Engineering - Mini Project: Build & Apply

Test-driven development (TDD)

📖 Scenario: You are working on a small software feature that calculates the area of a rectangle. To ensure your code works correctly, you will use Test-driven development (TDD). This means you will first write a test that defines the expected behavior, then write the code to pass the test, and finally complete the setup.

🎯 Goal: Build a simple TDD cycle by writing a test case for a rectangle area function, then write the function to pass the test, and finally complete the test setup.

📋 What You'll Learn

Create a test function named test_rectangle_area that checks if the area calculation is correct for a rectangle with width 5 and height 10.

Create a function named rectangle_area that takes width and height as parameters and returns the area.

Complete the test setup by calling the test function to run the test.

💡 Why This Matters

🌍 Real World

TDD is used in software development to ensure code quality and reduce bugs by writing tests before code.

💼 Career

Many software engineering roles require knowledge of TDD to write reliable and maintainable code.

1

Write the test function

Write a test function called test_rectangle_area that checks if calling rectangle_area(5, 10) returns 50. Use an assert statement inside the function.

Software Engineering

# Write the test function test_rectangle_area
# Your code here

Hint

Remember, the test function should use assert to check the expected output.

2

Write the function to pass the test

Write a function called rectangle_area that takes two parameters: width and height. It should return the product of width and height.

Software Engineering

def test_rectangle_area():
    assert rectangle_area(5, 10) == 50

# Write the rectangle_area function
# Your code here

Hint

The function should multiply width and height and return the result.

3

Call the test function

Add a call to the test_rectangle_area() function at the end of the code to run the test.

Software Engineering

def test_rectangle_area():
    assert rectangle_area(5, 10) == 50

def rectangle_area(width, height):
    return width * height

# Call the test function
# Your code here

Hint

Simply call the test function by its name followed by parentheses.

4

Complete the TDD cycle

Add a print statement print("Test passed!") after calling test_rectangle_area() to confirm the test passed successfully.

Software Engineering

def test_rectangle_area():
    assert rectangle_area(5, 10) == 50

def rectangle_area(width, height):
    return width * height

test_rectangle_area()

# Print confirmation message
# Your code here

Hint

This message helps confirm that the test ran without errors.