Book Image

Crafting Test-Driven Software with Python

By : Alessandro Molina
Book Image

Crafting Test-Driven Software with Python

By: Alessandro Molina

Overview of this book

Test-driven development (TDD) is a set of best practices that helps developers to build more scalable software and is used to increase the robustness of software by using automatic tests. This book shows you how to apply TDD practices effectively in Python projects. You’ll begin by learning about built-in unit tests and Mocks before covering rich frameworks like PyTest and web-based libraries such as WebTest and Robot Framework, discovering how Python allows you to embrace all modern testing practices with ease. Moving on, you’ll find out how to design tests and balance them with new feature development and learn how to create a complete test suite with PyTest. The book helps you adopt a hands-on approach to implementing TDD and associated methodologies that will have you up and running and make you more productive in no time. With the help of step-by-step explanations of essential concepts and practical examples, you’ll explore automatic tests and TDD best practices and get to grips with the methodologies and tools available in Python for creating effective and robust applications. By the end of this Python book, you will be able to write reliable test suites in Python to ensure the long-term resilience of your application using the range of libraries offered by Python for testing and development.
Table of Contents (18 chapters)
1
Section 1: Software Testing and Test-Driven Development
6
Section 2: PyTest for Python Testing
13
Section 3: Testing for the Web
16
About Packt

Using WebTest with web frameworks

We have seen how to use WebTest with a plain WSGI application, but thanks to the fact that WSGI is widely adopted by all major web frameworks, it's possible to use WebTest with nearly all Python web frameworks.

To showcase how WebTest is able to work with most Python web frameworks, we are going to replicate our httpbin in four web frameworks: Django, Flask, Pyramid, and TurboGears2, and for all of them we are going to use the same exact test suite. So we will share a single test suite between four different frameworks.

The first step is to create a test suite that can verify that our web applications are starting correctly. We are going to do so by adding a test that verifies all four web applications' answering with a "Hello World" message on the index of the website.

The first step is to create a tests/test_wsgiapp.py file that's going to contain our only test for now:

import webtest


class TestWSGIApp:
def test_home(self...