evolve: add test to demonstrate a bug when no active topic
Added test shows that the logic to find the destination for
`hg up` in the case when "working directory parent has a topic
but wdir has no active topic" is buggy.
This will be fixed in next patch.
#require test-repo pyflakes
Copied from Mercurial core (60ee2593a270)
$ cd "`dirname "$TESTDIR"`"
run pyflakes on all tracked files ending in .py or without a file ending
(skipping binary file random-seed)
$ hg locate -I 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \
> | xargs pyflakes 2>/dev/null