Skip a test in test_filediff_creator if Mercurial is not installed.
Review Request #14544 — Created July 31, 2025 and submitted — Latest diff uploaded
One of the unit tests in the FileDiffCreatorTests is pretty Mercurial
specific (testing the case of an hg diff without per-file revisions but
with a valid parent diff). Because we don't install Mercurial by
default, this test fails in a brand new virtualenv.
Ran test suite without Mercurial installed and saw that the failing
test was now skipped.