Expecttest

Expecttest is a Python library that implements 'expect tests' (also known as 'golden tests' or 'snapshot tests'). Unlike traditional asserts, it automatically populates the expected output of a test. When the test output changes, the library facilitates updating the expected output directly within the Python source file by modifying it in-place. The current version is 0.3.0, released in December 2024, indicating active development with a fairly rapid release cadence.