Book Image

Test-Driven Python Development

By : Siddharta Govindaraj
Book Image

Test-Driven Python Development

By: Siddharta Govindaraj

Overview of this book

This book starts with a look at the test-driven development process, and how it is different from the traditional way of writing code. All the concepts are presented in the context of a real application that is developed in a step-by-step manner over the course of the book. While exploring the common types of smelly code, we will go back into our example project and clean up the smells that we find. Additionally, we will use mocking to implement the parts of our example project that depend on other systems. Towards the end of the book, we'll take a look at the most common patterns and anti-patterns associated with test-driven development, including integration of test results into the development process.
Table of Contents (20 chapters)
Test-Driven Python Development
About the Author
About the Reviewers


Python comes bundled with its own packaging system called distutils. Although setuptools is the preferred way, we might sometimes want to stick with distutils because it is bundled in the standard library.

Distutils supports adding custom commands to We're going to use that feature to add a command that will run our tests. The following is what it looks like:

import subprocess
from distutils.core import setup, Command

class TestCommand(Command):

    user_options = []

    def initialize_options(self):

    def finalize_options(self):

    def run(self):
        p = subprocess.Popen(["python", "-m", "unittest"])
        raise SystemExit(p.returncode)

        "test": TestCommand

The cmdclass option allows us to pass in a dict containing command names mapped to a command class. We configure the test command and map it to our TestCommand class.

The TestCommand...