1 files changed, 22 insertions, 0 deletions
diff --git a/Lib/ctypes/test/test_win32.py b/Lib/ctypes/test/test_win32.py
index 7e6fe3fba0..da21336682 100644
--- a/Lib/ctypes/test/test_win32.py
+++ b/Lib/ctypes/test/test_win32.py
@@ -70,6 +70,28 @@ if sys.platform == "win32":
             self.assertEqual(ex.text, "text")
             self.assertEqual(ex.details, ("details",))
 
+    class TestWinError(unittest.TestCase):
+        def test_winerror(self):
+            # see Issue 16169
+            import errno
+            ERROR_INVALID_PARAMETER = 87
+            msg = FormatError(ERROR_INVALID_PARAMETER).strip()
+            args = (errno.EINVAL, msg, None, ERROR_INVALID_PARAMETER)
+
+            e = WinError(ERROR_INVALID_PARAMETER)
+            self.assertEqual(e.args, args)
+            self.assertEqual(e.errno, errno.EINVAL)
+            self.assertEqual(e.winerror, ERROR_INVALID_PARAMETER)
+
+            windll.kernel32.SetLastError(ERROR_INVALID_PARAMETER)
+            try:
+                raise WinError()
+            except OSError as exc:
+                e = exc
+            self.assertEqual(e.args, args)
+            self.assertEqual(e.errno, errno.EINVAL)
+            self.assertEqual(e.winerror, ERROR_INVALID_PARAMETER)
+
 class Structures(unittest.TestCase):
 
     def test_struct_by_value(self):