auto_stub.SimpleMock: add sanity - sort kwargs in expectations.

testing_support/tests/auto_stub_test.py

 # 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 sys
 import unittest
 
 from testing_support import auto_stub
 
 
 class MockedObject(auto_stub.SimpleMock):
   def method1(self, *args, **kwargs):
     self._register_call(*args, **kwargs)
 
 
 class TestSimpleMock(unittest.TestCase):
   def test_auto_mock(self):
     obj = MockedObject(self)
     obj.method1(1, param=2)
     obj.check_calls(['method1(1, param=2)'])
 
+  def test_auto_mock_sorted(self):
+    obj = MockedObject(self)
+    obj.method1(1, c=4, a=2, b=3)
+    # tandrii@ is very surprised this is actually deterministic.
+    obj.check_calls(['method1(1, a=2, c=4, b=3)'])
+    # The proper and sane way is to always sort them.
+    obj = MockedObject(self, sorted_kwargs=True)
+    obj.method1(1, c=4, a=2, b=3)
+    obj.check_calls(['method1(1, a=2, b=3, c=4)'])
+
+
 def return_one():
   return 1
 
 def return_two():
   return 2
 
 class TestAutoStubTestCase(auto_stub.TestCase):
   def test_mock_method(self):
     # mock one function
     self.assertEqual(return_one(), 1)
     self.mock(sys.modules[__name__], 'return_one', lambda: 'mocked')
     self.assertEqual(return_one(), 'mocked')
     auto_stub.TestCase.tearDown(self)
     self.assertEqual(return_one(), 1)
 
     # mock two functions
     self.assertEqual(return_one(), 1)
     self.assertEqual(return_two(), 2)
     self.mock(sys.modules[__name__], 'return_one', lambda: 'mocked1')
     self.mock(sys.modules[__name__], 'return_two', lambda: 'mocked2')
     self.assertEqual(return_one(), 'mocked1')
     self.assertEqual(return_two(), 'mocked2')
     auto_stub.TestCase.tearDown(self)
     self.assertEqual(return_one(), 1)
     self.assertEqual(return_two(), 2)