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|
"""
Test behaviors specific to importlib_metadata.
These tests are excluded downstream in CPython as they
test functionality only in importlib_metadata or require
behaviors ('packaging') that aren't available in the
stdlib.
"""
import unittest
import packaging.requirements
import packaging.version
from importlib_metadata import (
_compat,
version,
)
from . import fixtures
class IntegrationTests(fixtures.DistInfoPkg, unittest.TestCase):
def test_package_spec_installed(self):
"""
Illustrate the recommended procedure to determine if
a specified version of a package is installed.
"""
def is_installed(package_spec):
req = packaging.requirements.Requirement(package_spec)
return version(req.name) in req.specifier
assert is_installed('distinfo-pkg==1.0')
assert is_installed('distinfo-pkg>=1.0,<2.0')
assert not is_installed('distinfo-pkg<1.0')
class FinderTests(fixtures.Fixtures, unittest.TestCase):
def test_finder_without_module(self):
class ModuleFreeFinder:
"""
A finder without an __module__ attribute
"""
def find_module(self, name):
pass
def __getattribute__(self, name):
if name == '__module__':
raise AttributeError(name)
return super().__getattribute__(name)
self.fixtures.enter_context(fixtures.install_finder(ModuleFreeFinder()))
_compat.disable_stdlib_finder()
|
