Issue #14482: Raise a ValueError, not a NameError, when trying to create

a multiprocessing Client or Listener with an AF_UNIX type address under
Windows.  Patch by Popa Claudiu.

Lib/test/test_multiprocessing.py

@@ -2331,6 +2331,12 @@ class TestInvalidFamily(unittest.TestCase):
         with self.assertRaises(ValueError):
             multiprocessing.connection.Listener(r'\\.\test')
 
+    @unittest.skipUnless(WIN32, "skipped on non-Windows platforms")
+    def test_invalid_family_win32(self):
+        with self.assertRaises(ValueError):
+            multiprocessing.connection.Listener('/var/test.pipe')
+
+
 testcases_other = [OtherTest, TestInvalidHandle, TestInitializers,
                    TestStdinBadfiledescriptor, TestInvalidFamily]