tests: fix isinstance test of wrong variable
3086a8627b2970cd7fbf49bc69413c08c68d5514 changed self._case to be a list, but
it was forgotten to adjust this line.
discovery: avoid wrong detection of multiple branch heads (
issue6256)
This fix the code using obsolescence markers to remove "to be obsoleted" heads
during the detection of new head creation from push. The code turned out to not
use the branch information at all. This lead changeset from different branch to
be detected as new head on unrelated branch.
The code fix is actually quite simple. New tests have been added to covers
these cases.
Differential Revision: https://phab.mercurial-scm.org/D8259
tests: avoid implicit conversion of str to unicode
On Python 2, str.encode('utf-8') implicitly converts the string to unicode and
then back to str.
Using _sys2bytes() ensures that opt is only encoded on Python 3, where opt is
unicode.
Although contrived, before this change, a UnicodeDecodeError could be triggered
on Python 2 when passing non-ascii values to --extra-config-opt.