Book Image

Hands-On Test Driven Development with Python [Video]

By : Richard Wells
Book Image

Hands-On Test Driven Development with Python [Video]

By: Richard Wells

Overview of this book

Do you want to be one of the core developers at your company—the person that everyone wants on their team, and who can deliver new features that work on time? Unit Testing and Test-Driven Development (TDD) are key disciplines that can help you achieve that goal. In this video tutorial, you’ll learn about the PyTest testing library and how it’s used to write unit tests in Python. You’ll also set up some common Python development environments to use PyTest. You’ll create isolated test environments with Test Doubles and learn how to implement and use them with unittest.mock. Moving on, you’ll get to know some of the best practices in Unit Testing and TDD and get some hands-on experience with programming by implementing unit tests using TDD in Python. By the end of this course, you’ll be able to apply the practices of Unit Testing and TDD on a daily basis to radically increase the quality of your code and help you and your company achieve your goals faster than ever before. All the code and supporting files for this course are available on Github at https://github.com/PacktPublishing/-Hands-on-Test-Driven-Development-with-Python

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Hands-On Test Driven Development with Python [Video]
Richard Wells
May, 2018 | 2 hours 18 minutes
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Table of Contents (5 chapters)
Free Chapter
1
Overview and Setting Up Your Development Environment
The Course Overview
Overview of Unit Testing and TDD Practices and How They Help You Write Better Code Faster
Simple Unit Testing and TDD Coding Session
Creating Python Virtual Environments to Help Manage Your Python Projects
Setting Up PyTest in PyCharm
Setting Up PyTest in Eclipse
2
PyTest Framework Supporting Functional Testing
Introduction of PyTest Framework
Test Discovery Function
XUnit Style Setup and Teardown
Test Fixtures Environment
Assert Statements and Exceptions
PyTest Command Line Arguments
3
Hands-On Example - Implementing a Checkout Cart with TDD
Setting Up a Checkout Cart and the 1st Test Case
Add Items, Add Item Prices, and Calculate the Total
Add Multiple Items and Calculate Total
Add and Apply Discounts
Throw Exception When Adding an Item with No Price
4
Creating an Isolated Test Environment with Test Doubles
Test Doubles and the unittest.mock Framework
Unittest.mock - Mocking the File System Examples
Unittest.mock - Mocking an Abstract Interface
Unittest.mock - Mocking a Network Connection
Adding Code to Checkout Cart to Read Prices from a File
5
Unit Testing and TDD Best Practices
Unit Testing and TDD Best Practices
Hands On Example of Applying Best Practices
Overview of Code Coverage and PyTest.cov
PyTest.cov Hands On Example with Simple Test Cases
Chapter 4
Creating an Isolated Test Environment with Test Doubles
Content Locked
Section 5
Adding Code to Checkout Cart to Read Prices from a File
In this video, we will update the Checkout class to have a function to read in item prices from a file and we’ll mock out the file system calls in our unit test. - Implement the 1st test case to be able to call the new readPricesFile method - Implement the second test case where the readPricesFile method is updated to actually open and read the lines from the file - Review the mock setup code in the unit test to ensure you understand how the mocks are allowing the python “with” operator to work and to then iterate over the lines being read from the mocked file object
Previous Section
End of Chapter 4
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