The modern virtual environment structure does not allow us to enable
"fake user site" while disabling the global site, so we need to do more
fine-grained configuration to correctly set up test environments for
each test case.
With this done, we can also properly support the stdlib venv ad the test
environment backend, since it basically works identically with modern
virtualenv. The incompatible_with_test_venv is thus removed.
The pip-specific Path implementation has been removed, and all its
usages replaced by pathlib.Path. The tmpdir and tmpdir_factory fixtures
are also removed, and all usages are replaced by tmp_path and
tmp_path_factory, which use pathlib.Path.
The pip() function now also accepts pathlib.Path so we don't need to put
str() everywhere. Path arguments are coerced with os.fspath() into str.
setuptools removed use_2to3 in version v58.0.1 (2021-09-06). Some tests
install the anyjson package which uses this feature and so those tests
result in a command failure. The failure appeared as:
error in anyjson setup command: use_2to3 is invalid.
As anyjson package is no longer maintained (last release was 2012),
change the tests to use a package that is healthy.
For details on the setuptools change, see the history at:
https://setuptools.readthedocs.io/en/latest/history.html#v58-0-2
Use the tool com2ann to automatically convert most type comments to type
annotations. Some type comments continue to exist where any work beyond
the automatic conversion was required (for example, additional
formatting or circular references).
For additional information on the com2ann tool, see:
https://github.com/ilevkivskyi/com2ann
Use pyupgrade to convert simple string formatting to use f-string
syntax. pyupgrade is intentionally timid and will not create an f-string
if it would make the expression longer or if the substitution parameters
are anything but simple names or dotted names.
Similar to our previous test refactoring, this removes the usage of
`--home` from the test command.
"Overriding" in the original test meant "placed after" in the
command-line arguments, which makes sense because setuptools will use
the last argument passed.
The current test depends on passing `--home` to `--install-option`.
Since we would like that to fail, we need to use another argument. None
of the other possible arguments have a visible side-effect, so we just
write the provided arguments to a file and check that in the test.
