bpo-31676: Fix test_imp.test_load_source() side effect (#3871)
test_load_source() now replaces the current __name__ module with a
temporary module to prevent side effects.
diff --git a/Lib/test/test_imp.py b/Lib/test/test_imp.py
index 51bec50..1ef0acc 100644
--- a/Lib/test/test_imp.py
+++ b/Lib/test/test_imp.py
@@ -310,8 +310,13 @@
loader.get_data(imp.__file__) # Will need to create a newly opened file
def test_load_source(self):
- with self.assertRaisesRegex(ValueError, 'embedded null'):
- imp.load_source(__name__, __file__ + "\0")
+ # Create a temporary module since load_source(name) modifies
+ # sys.modules[name] attributes like __loader___
+ modname = f"tmp{__name__}"
+ mod = type(sys.modules[__name__])(modname)
+ with support.swap_item(sys.modules, modname, mod):
+ with self.assertRaisesRegex(ValueError, 'embedded null'):
+ imp.load_source(modname, __file__ + "\0")
@support.cpython_only
def test_issue31315(self):