Comment 0 for bug 902881

subunit was intended to support dropping into a debugger in a run. However the current parser is line-based.

And even with that fixed, some things like parallel tests are intrinsically incompatible with naively just glueing stdin and stdout together.

Perhaps testrepository should be told when you want to drop into a debugger and it can then do some extra things to get out of the way (e.g. run a different runner, exec() rather than fork+exec() etc).