Unit Testing and Test Driven Development in Python

Discover how to develop reliable, high-quality Python code with unit testing and test-driven development.

Introduction

• Welcome

1. Overview of Test-Driven Development

• What is unit testing?
• What is test-driven development (TDD)?
• Example TDD session: The FizzBuzz Kata

2. Setting Up a Development Environment

• Python virtual environments
• Set up pytest in PyCharm
• Set up pytest in Eclipse PyDev

3. Pytest Overview

• Overview of pytest
• Test discovery
• An xunit-style setup and teardown
• Test fixtures
• Assert statements and exceptions
• Command line arguments: pytest

4. The Supermarket Checkout Kata

• Supermarket Checkout Kata overview
• Setup and first test case
• Add items, add items prices, and calculate current total
• Add multiple items and calculate total
• Add and apply discounts
• Throw exception when adding an item with no price

5. Test Doubles

• Test doubles, unittest.mock, and monkeypatch overview
• Example: unittest.mock

6. Test-Driven Development Best Practices

• TDD best practices

Conclusion

• Summary