Hands-On RESTful Python Web Services - Second Edition

Writing the first round of unit tests

Now, we will write the first round of unit tests. Specifically, we will write unit tests related to the LED resources. Test fixtures provide a fixed baseline to enable us to reliably and repeatedly execute tests. Pytest makes it easy to declare a test fixture function by marking a function with the @pytest.fixture decorator. Then, whenever we use the fixture function name as an argument in a test function declaration, pytest will make the fixture function provide the fixture object.

The pytest-tornasync plugin provides us with many fixtures that we will use to easily write tests for our Tornado API. In order to work with this plugin, we must declare a fixture function, named app, that returns a tornado.web.Application ...