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

Pattern – using attributes

The nose2 test runner has a useful attrib plugin that allows us to set attributes on test cases and select tests that match particular attributes.

For example, the following test has three attributes set:

def test_stock_update(self):, 2, 12), price=10)

test_stock_update.slow = True
test_stock_update.integration = True
test_stock_update.python = ["2.6", "3.4"]

When nose2 is run via the following command, then the plugin is enabled, and only the tests that have the integration attribute set to True are executed:

nose2 --plugin=nose2.plugins.attrib -A "integration"

The plugin can also run all tests that have a specific value in a list. Take the following command:

nose2 --plugin=nose2.plugins.attrib -A "python=2.6"

The preceding command will run all tests that have the python attribute set to 2.6 or containing the value 2.6 in a list. It will select and run the test_stock_update test, shown previously...