So that you can run your unit test from some unknown state that may not even be reachable from the current text of the code, rather than running it from the start in a reproducible way? Why would that be something you want?

Unit testing was born in the Smalltalk community, good tooling is orthogonal to having tests.

Throw a breakpoint in the unit test.

It won't work on the CLI version, and unless you are using an IDE with a backtracking debugging it won't help.