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bpo-42089: Sync with current cpython branch of importlib_metadata (GH-22775)

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~~The only differences are in the test files.~~

Automerge-Triggered-By: @jaraco
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Barry Warsaw 2020-10-19 14:14:21 -07:00 • committed by GitHub
parent 95ad890a7b
commit 96ddc58281
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4 changed files with 26 additions and 6 deletions
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12
Lib/test/test_importlib/test_main.py
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@ -32,6 +32,18 @@ class BasicTests(fixtures.DistInfoPkg, unittest.TestCase):
with self.assertRaises(PackageNotFoundError):
Distribution.from_name('does-not-exist')
def test_package_not_found_mentions_metadata(self):
"""
When a package is not found, that could indicate that the
packgae is not installed or that it is installed without
metadata. Ensure the exception mentions metadata to help
guide users toward the cause. See #124.
"""
with self.assertRaises(PackageNotFoundError) as ctx:
Distribution.from_name('does-not-exist')
assert "metadata" in str(ctx.exception)
def test_new_style_classes(self):
self.assertIsInstance(Distribution, type)