match: make sure `root` argument is always an absolute path (API)
The `root` argument should already be an absolute path, but we had
tests that passed a relative path. This patch fixes up the tests and
adds an assertion.
This assumes that `os.path.isabs('/repo')` will be `True` on all
platforms we care to run tests on. Augie tested for me that it does
work on Windows, so that's good enough for me.
Differential Revision: https://phab.mercurial-scm.org/D7649
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
| contrib/python-zstandard/
'''
skip-string-normalization = true
quiet = true