Py-python-subunit

Jul 20, 2023

Python implementation of subunit test streaming protocol

Subunit is a streaming protocol for test results.

There are two major revisions of the protocol. Version 1 was trivially human readable but had significant defects as far as highly parallel testing was concerned - it had no room for doing discovery and execution in parallel, required substantial buffering when multiplexing and was fragile - a corrupt byte could cause an entire stream to be misparsed. Version 1.1 added encapsulation of binary streams which mitigated some of the issues but the core remained.

Version 2 shares many of the good characteristics of Version 1 - it can be embedded into a regular text stream e.g. from a build system and it still models xUnit style test execution. It also fixes many of the issues with Version 1 - Version 2 can be multiplexed without excessive buffering in time or space, it has a well defined recovery mechanism for dealing with corrupted streams e.g. where two processes write to the same stream concurrently, or where the stream generator suffers a bug.



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