bpo-29851: Have importlib.reload() raise ImportError if the module's spec is not found (GH-972)

1 files changed, 12 insertions, 2 deletions

diff --git a/Lib/test/test_importlib/test_api.py b/Lib/test/test_importlib/test_api.py
index b0a94aa..50dbfe1 100644
--- a/Lib/test/test_importlib/test_api.py
+++ b/Lib/test/test_importlib/test_api.py
@@ -197,8 +197,6 @@ class FindLoaderPEP302Tests(FindLoaderTests):
 
 class ReloadTests:
 
-    """Test module reloading for builtin and extension modules."""
-
     def test_reload_modules(self):
         for mod in ('tokenize', 'time', 'marshal'):
             with self.subTest(module=mod):
@@ -361,6 +359,18 @@ class ReloadTests:
             reloaded = self.init.reload(ham)
             self.assertIs(reloaded, ham)
 
+    def test_module_missing_spec(self):
+        #Test that reload() throws ModuleNotFounderror when reloading
+        # a module who's missing a spec. (bpo-29851)
+        name = 'spam'
+        with test_util.uncache(name):
+            module = sys.modules[name] = types.ModuleType(name)
+            # Sanity check by attempting an import.
+            module = self.init.import_module(name)
+            self.assertIsNone(module.__spec__)
+            with self.assertRaises(ModuleNotFoundError):
+                self.init.reload(module)
+
 
 (Frozen_ReloadTests,
  Source_ReloadTests