add depreciation.argument_renamed

1 files changed, 14 insertions, 0 deletions

diff --git a/test/unittest_deprecation.py b/test/unittest_deprecation.py
index 7778325..7881252 100644
--- a/test/unittest_deprecation.py
+++ b/test/unittest_deprecation.py
@@ -93,6 +93,20 @@ class RawInputTC(TestCase):
         self.assertFalse(hasattr(some_class, "new"))
         self.assertFalse(hasattr(some_class, "old"))
 
+    def test_argument_renamed(self):
+        @deprecation.argument_renamed(old_name="old", new_name="new")
+        def some_function(new):
+            return new
+
+        self.assertEqual(some_function(new=42), 42)
+        self.assertEqual(some_function(old=42), 42)
+        self.assertEqual(self.messages,
+                         ['argument old of callable some_function has been renamed and is '
+                          'deprecated, use keyword argument new instead'])
+
+        with self.assertRaises(ValueError):
+            some_function(new=42, old=42)
+
     def test_renamed(self):
         def any_func():
             pass