Observation of the day: conditional code which calls coroutines is awkward to unit test...

@rule(Foo, [Select(Bar)]
def foo(bar):
  if True:
    b = yield Get(Baz, Bar, bar)
  else:
    b = yield Get(Bash, Bar, bar)
  yield b.Foo

In

run_rule

, I need paths from

Bar

to both

Baz

and

Bash

in my mock rules dict, not just the one that is used, because of the pre-parsing of `Get`s