342: Added unit test that TypeError is raised when Param() is created with extra kw args

ipalib/frontend.py

@@ -134,8 +134,9 @@ class Param(plugable.ReadOnly):
             kw.update(kw_from_spec)
         default = dict(self.__default)
         if not set(default).issuperset(kw):
+            extra = sorted(set(kw) - set(default))
             raise TypeError(
-                'no such kwargs: %r' % list(set(kw) - set(default))
+                'Param.__init__() takes no such kwargs: %s' % ', '.join(extra)
             )
         default.update(kw)
         self.__kw = default

ipalib/tests/test_frontend.py

@@ -169,6 +169,10 @@ class test_Param(ClassChecker):
         assert o.required is True
         assert o.multivalue is True
 
+        e = raises(TypeError, self.cls, name, whatever=True, another=False)
+        assert str(e) == \
+            'Param.__init__() takes no such kwargs: another, whatever'
+
     def test_convert(self):
         """
         Test the `frontend.Param.convert` method.