Awesome pytest 
Videos
Michael Tom-Wing, Christie Wilson - Introduction to Unit Testing in Python with Pytest - PyCon 2016
Why I use py.test and maybe you should too
Python Code Review: Adding Pytest Tests to an Existing Python Web Scraper
Holger Krekel - pytest - rapid and simple testing with Python
Articles
Python unit testing with Pytest and Mock
Django Test Driven Development with Pytest
Creating a PySpark project with pytest, pyenv, and egg files
Unit testing Apache Spark with py.test
Testing sys.exit() with pytest
Passing fixtures to tests in pytest
Django + Mongo = Pytest FTW! A clean way to manage connecting and dropping of database between tests
Pytest-mock. How to mock your database connection
How to use pytest fixtures in Django testing
Testing Python Applications with Pytest
Presentations
Introduction to pytest - Andreas Pelme - Euro Python 2014
Code samples and projets
Requests - Python HTTP Requests for Humans™ and Pytest