1 files changed, 76 insertions, 0 deletions
diff --git a/Lib/test/test_importlib/extension/test_loader.py b/Lib/test/test_importlib/extension/test_loader.py
new file mode 100644
index 0000000000..e790675f58
--- /dev/null
+++ b/Lib/test/test_importlib/extension/test_loader.py
@@ -0,0 +1,76 @@
+from importlib import machinery
+from . import util as ext_util
+from .. import abc
+from .. import util
+
+import os.path
+import sys
+import unittest
+
+
+class LoaderTests(abc.LoaderTests):
+
+    """Test load_module() for extension modules."""
+
+    def setUp(self):
+        self.loader = machinery.ExtensionFileLoader(ext_util.NAME,
+                                                     ext_util.FILEPATH)
+
+    def load_module(self, fullname):
+        return self.loader.load_module(fullname)
+
+    def test_load_module_API(self):
+        # Test the default argument for load_module().
+        self.loader.load_module()
+        self.loader.load_module(None)
+        with self.assertRaises(ImportError):
+            self.load_module('XXX')
+
+
+    def test_module(self):
+        with util.uncache(ext_util.NAME):
+            module = self.load_module(ext_util.NAME)
+            for attr, value in [('__name__', ext_util.NAME),
+                                ('__file__', ext_util.FILEPATH),
+                                ('__package__', '')]:
+                self.assertEqual(getattr(module, attr), value)
+            self.assertIn(ext_util.NAME, sys.modules)
+            self.assertIsInstance(module.__loader__,
+                                  machinery.ExtensionFileLoader)
+
+    # No extension module as __init__ available for testing.
+    test_package = None
+
+    # No extension module in a package available for testing.
+    test_lacking_parent = None
+
+    def test_module_reuse(self):
+        with util.uncache(ext_util.NAME):
+            module1 = self.load_module(ext_util.NAME)
+            module2 = self.load_module(ext_util.NAME)
+            self.assertIs(module1, module2)
+
+    # No easy way to trigger a failure after a successful import.
+    test_state_after_failure = None
+
+    def test_unloadable(self):
+        name = 'asdfjkl;'
+        with self.assertRaises(ImportError) as cm:
+            self.load_module(name)
+        self.assertEqual(cm.exception.name, name)
+
+    def test_is_package(self):
+        self.assertFalse(self.loader.is_package(ext_util.NAME))
+        for suffix in machinery.EXTENSION_SUFFIXES:
+            path = os.path.join('some', 'path', 'pkg', '__init__' + suffix)
+            loader = machinery.ExtensionFileLoader('pkg', path)
+            self.assertTrue(loader.is_package('pkg'))
+
+
+def test_main():
+    from test.support import run_unittest
+    run_unittest(LoaderTests)
+
+
+if __name__ == '__main__':
+    test_main()