Python Testing with pytest: Simple, Rapid, Effective, and Scalable

Test applications, packages, and libraries large and small with pytest,  Python's most powerful testing framework. pytest helps you write tests  quickly and keep them readable and maintainable. In this fully revised  edition, explore pytest's superpowers - simple asserts, fixtures,  parametrization, markers, and plugins - while creating simple tests and  test suites against a small database application. Using a robust yet  simple fixture model, it's just as easy to write small tests with pytest  as it is to scale up to complex functional testing. This book shows you  how.

pytest is undeniably the best choice for testing Python  projects. It's a full-featured, flexible, and extensible testing  framework. pytest's fixture model allows you to share test data and  setup procedures across multiple layers of tests. The pytest framework  gives you powerful features such as assert rewriting, parametrization,  markers, plugins, parallel test execution, and clear test failure  reporting - with no boilerplate code.

With simple step-by-step  instructions and sample code, this book gets you up to speed quickly on  this easy-to-learn yet powerful tool. Write short, maintainable tests  that elegantly express what you're testing. Speed up test times by  distributing tests across multiple processors and running tests in  parallel. Use Python's builtin assert statements instead of awkward  assert helper functions to make your tests more readable. Move setup  code out of tests and into fixtures to separate setup failures from test  failures. Test error conditions and corner cases with expected  exception testing, and use one test to run many test cases with  parameterized testing. Extend pytest with plugins, connect it to  continuous integration systems, and use it in tandem with tox, mock,  coverage, and even existing unittest tests.

Write simple, maintainable tests quickly with pytest.