Fix param_name for Properties.

recipe_engine/unittests/loader_test.py

 #!/usr/bin/env python
 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 import sys
 import unittest
 
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.dirname(
@@ skipping 60 matching lines @@
       'b': make_prop(name="b"),
     }
 
     props = {
       'a': 1,
       'b': 2,
     }
     self.assertEqual(1, self.invoke(func, props, prop_defs, ['a', 'b']))
 
   def testInvokeParamName(self):
-    """Tests invoke with two different properties."""
-    def func(a):
-      return a
+    """Tests invoke with a param name."""
+    def func(c):
+      return c
 
     prop_defs = {
-      'a': make_prop(name='b'),
+      'b.a': make_prop(name="c", param_name="c"),
     }
 
     props = {
-      'b': 2,
+      'b.a': 2,
     }
-    self.assertEqual(2, self.invoke(func, props, prop_defs, ['a']))
+    self.assertEqual(2, self.invoke(func, props, prop_defs, ['c']))
 
   def testInvokeClass(self):
     """Tests invoking a class."""
     class test(object):
       def __init__(self, a, b): # pylint: disable=unused-argument
         self.answer = a
 
     prop_defs = {
       'a': make_prop(name="a"),
       'b': make_prop(name="b"),
@@ skipping 39 matching lines @@
 
     with mock.patch(
         'recipe_engine.loader._invoke_with_properties') as mocked_invoke:
       loader.invoke_with_properties(TestClass, None, None)
       args, _ = mocked_invoke.call_args
       self.assertTrue(['api', 'foo', 'bar'] in args)
 
 
 if __name__ == '__main__':
   unittest.main()