@dmcg here’s an experiment that allows a fixture to be derived from the parent fixture
and the full name of the test, Use cases include creating a temp directory named after the test, or using the test name to create unique data in a persistent store, without having to define a TestTransform to get hold of the name of the test.
https://github.com/npryce/minutest/tree/pass-test-descriptor-to-derive-fixture