Unit Testing and Test Driven Development in Python

Introduction

• Welcome

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

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

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

• 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

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

• TDD best practices

• Summary