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-rw-r--r--Lib/test/test_importlib/test_api.py14
1 files changed, 14 insertions, 0 deletions
diff --git a/Lib/test/test_importlib/test_api.py b/Lib/test/test_importlib/test_api.py
index f66e257..ac88b2b 100644
--- a/Lib/test/test_importlib/test_api.py
+++ b/Lib/test/test_importlib/test_api.py
@@ -116,6 +116,20 @@ class FindLoaderTests(unittest.TestCase):
with self.assertRaises(ValueError):
importlib.find_loader(name)
+ def test_sys_modules_loader_is_not_set(self):
+ # Should raise ValueError
+ # Issue #17099
+ name = 'some_mod'
+ with util.uncache(name):
+ module = imp.new_module(name)
+ try:
+ del module.__loader__
+ except AttributeError:
+ pass
+ sys.modules[name] = module
+ with self.assertRaises(ValueError):
+ importlib.find_loader(name)
+
def test_success(self):
# Return the loader found on sys.meta_path.
name = 'some_mod'