From 416f12ddb3b7d780bb75563414b88b32c0cf7e67 Mon Sep 17 00:00:00 2001 From: Meador Inge Date: Wed, 14 Dec 2011 22:23:46 -0600 Subject: Issue #13591: import_module potentially imports a module twice. --- Lib/importlib/test/test_api.py | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'Lib/importlib/test/test_api.py') diff --git a/Lib/importlib/test/test_api.py b/Lib/importlib/test/test_api.py index 0ffa3c4d80..a151626de7 100644 --- a/Lib/importlib/test/test_api.py +++ b/Lib/importlib/test/test_api.py @@ -67,6 +67,23 @@ class ImportModuleTests(unittest.TestCase): importlib.import_module('.support') + def test_loaded_once(self): + # Issue #13591: Modules should only be loaded once when + # initializing the parent package attempts to import the + # module currently being imported. + b_load_count = 0 + def load_a(): + importlib.import_module('a.b') + def load_b(): + nonlocal b_load_count + b_load_count += 1 + code = {'a': load_a, 'a.b': load_b} + modules = ['a.__init__', 'a.b'] + with util.mock_modules(*modules, module_code=code) as mock: + with util.import_state(meta_path=[mock]): + importlib.import_module('a.b') + self.assertEqual(b_load_count, 1) + def test_main(): from test.support import run_unittest run_unittest(ImportModuleTests) -- cgit v1.2.1