pytest

Overview

pytest is the de-facto standard Python test framework. Its whole value proposition is removing ceremony: a test is a plain function whose name starts with test_, a check is a bare assert, and everything a test needs is requested by name and injected. There are no TestCase subclasses to inherit, no setUp/tearDown to override, and no assertEqual family to memorize — yet failures still report rich, introspected values.

The mental-model shift (vs. unittest):