Hitchstory is a type-safe StrictYAML python integration testing framework exploring some interesting ideas around this.

https://hitchdev.com/hitchstory/

Example:

https://hitchdev.com/hitchstory/using/behavior/run-single-na...

Source:

https://github.com/hitchdev/hitchstory/blob/master/hitch/sto...

See also the explanation of self-rewriting tests:

https://hitchdev.com/hitchstory/why/rewrite/