bpo-37972: unittest.mock._Call now passes on __getitem__ to the __getattr__ chaining so that call() can be subscriptable (GH-15565)

* bpo-37972: unittest.mock._Call now passes on __getitem__ to the __getattr__ chaining so that call() can be subscriptable

* 📜🤖 Added by blurb_it.

* Update 2019-08-28-21-40-12.bpo-37972.kP-n4L.rst

added name of the contributor

* bpo-37972: made all dunder methods chainable for _Call

* bpo-37972: delegate only attributes of tuple instead to __getattr__

1 files changed, 20 insertions, 0 deletions

diff --git a/Lib/unittest/test/testmock/testhelpers.py b/Lib/unittest/test/testmock/testhelpers.py
index 301bca4..f3c7acb 100644
--- a/Lib/unittest/test/testmock/testhelpers.py
+++ b/Lib/unittest/test/testmock/testhelpers.py
@@ -334,6 +334,26 @@ class CallTest(unittest.TestCase):
         self.assertEqual(_Call((('bar', 'barz'),),)[0], '')
         self.assertEqual(_Call((('bar', 'barz'), {'hello': 'world'}),)[0], '')
 
+    def test_dunder_call(self):
+        m = MagicMock()
+        m().foo()['bar']()
+        self.assertEqual(
+            m.mock_calls,
+            [call(), call().foo(), call().foo().__getitem__('bar'), call().foo().__getitem__()()]
+        )
+        m = MagicMock()
+        m().foo()['bar'] = 1
+        self.assertEqual(
+            m.mock_calls,
+            [call(), call().foo(), call().foo().__setitem__('bar', 1)]
+        )
+        m = MagicMock()
+        iter(m().foo())
+        self.assertEqual(
+            m.mock_calls,
+            [call(), call().foo(), call().foo().__iter__()]
+        )
+
 
 class SpecSignatureTest(unittest.TestCase):