[Python-checkins] cpython (3.4): Issue 17826. Setting an iterable side_effect on a mock created by

[michael.foord]

http://hg.python.org/cpython/rev/1e3c64470629
changeset:   90283:1e3c64470629
branch:      3.4
parent:      90280:4f23648b7c97
user:        Michael Foord <michael at voidspace.org.uk>
date:        Mon Apr 14 16:09:42 2014 -0400
summary:
  Issue 17826. Setting an iterable side_effect on a mock created by create_autospec now works

files:
  Lib/unittest/mock.py                   |  15 ++++++++++-
  Lib/unittest/test/testmock/testmock.py |  18 ++++++++++++++
  Misc/NEWS                              |   3 ++
  3 files changed, 34 insertions(+), 2 deletions(-)


diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -343,7 +343,14 @@
         value._mock_name = name
     return True
 
-
+# Internal class to identify if we wrapped an iterator object or not.
+class _MockIter(object):
+    def __init__(self, obj):
+        self.obj = iter(obj)
+    def __iter__(self):
+        return self
+    def __next__(self):
+        return next(self.obj)
 
 class Base(object):
     _mock_return_value = DEFAULT
@@ -495,7 +502,11 @@
         delegated = self._mock_delegate
         if delegated is None:
             return self._mock_side_effect
-        return delegated.side_effect
+        sf = delegated.side_effect
+        if sf is not None and not callable(sf) and not isinstance(sf, _MockIter):
+            sf = _MockIter(sf)
+            delegated.side_effect = sf
+        return sf
 
     def __set_side_effect(self, value):
         value = _try_iter(value)
diff --git a/Lib/unittest/test/testmock/testmock.py b/Lib/unittest/test/testmock/testmock.py
--- a/Lib/unittest/test/testmock/testmock.py
+++ b/Lib/unittest/test/testmock/testmock.py
@@ -154,6 +154,24 @@
         mock = Mock(side_effect=side_effect, return_value=sentinel.RETURN)
         self.assertEqual(mock(), sentinel.RETURN)
 
+    def test_autospec_side_effect(self):
+        # Test for issue17826
+        results = [1, 2, 3]
+        def effect():
+            return results.pop()
+        def f():
+            pass
+
+        mock = create_autospec(f)
+        mock.side_effect = [1, 2, 3]
+        self.assertEqual([mock(), mock(), mock()], [1, 2, 3],
+                          "side effect not used correctly in create_autospec")
+        # Test where side effect is a callable
+        results = [1, 2, 3]
+        mock = create_autospec(f)
+        mock.side_effect = effect
+        self.assertEqual([mock(), mock(), mock()], [3, 2, 1],
+                          "callable side effect not used correctly")
 
     @unittest.skipUnless('java' in sys.platform,
                           'This test only applies to Jython')
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -33,6 +33,9 @@
 Library
 -------
 
+- Issue #17826: setting an iterable side_effect on a mock function created by
+  create_autospec now works. Patch by Kushal Das.
+
 - Issue #7776: Fix ``Host:`` header and reconnection when using
   http.client.HTTPConnection.set_tunnel(). Patch by Nikolaus Rath.
 

-- 
Repository URL: http://hg.python.org/cpython