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import pathlib
import sys
import unittest
from importlib_metadata import (
distribution,
distributions,
entry_points,
metadata,
version,
)
from .. import fixtures
class OldStdlibFinderTests(fixtures.DistInfoPkgOffPath, unittest.TestCase):
def setUp(self):
if sys.version_info >= (3, 10):
self.skipTest("Tests specific for Python 3.8/3.9")
super().setUp()
def _meta_path_finder(self):
from importlib.metadata import (
Distribution,
DistributionFinder,
PathDistribution,
)
from importlib.util import spec_from_file_location
path = pathlib.Path(self.site_dir)
class CustomDistribution(Distribution):
def __init__(self, name, path):
self.name = name
self._path_distribution = PathDistribution(path)
def read_text(self, filename):
return self._path_distribution.read_text(filename)
def locate_file(self, path):
return self._path_distribution.locate_file(path)
class CustomFinder:
@classmethod
def find_spec(cls, fullname, _path=None, _target=None):
candidate = pathlib.Path(path, *fullname.split(".")).with_suffix(".py")
if candidate.exists():
return spec_from_file_location(fullname, candidate)
@classmethod
def find_distributions(self, context=DistributionFinder.Context()):
for dist_info in path.glob("*.dist-info"):
yield PathDistribution(dist_info)
name, _, _ = str(dist_info).partition("-")
yield CustomDistribution(name + "_custom", dist_info)
return CustomFinder
def test_compatibility_with_old_stdlib_path_distribution(self):
"""
Given a custom finder that uses Python 3.8/3.9 importlib.metadata is installed,
when importlib_metadata functions are called, there should be no exceptions.
Ref python/importlib_metadata#396.
"""
self.fixtures.enter_context(fixtures.install_finder(self._meta_path_finder()))
assert list(distributions())
assert distribution("distinfo_pkg")
assert distribution("distinfo_pkg_custom")
assert version("distinfo_pkg") > "0"
assert version("distinfo_pkg_custom") > "0"
assert list(metadata("distinfo_pkg"))
assert list(metadata("distinfo_pkg_custom"))
assert list(entry_points(group="entries"))
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