Closes issue 15323. Improve failure message of Mock.assert_called_once_with
diff --git a/Doc/library/unittest.mock.rst b/Doc/library/unittest.mock.rst
index bed698a..3e50031 100644
--- a/Doc/library/unittest.mock.rst
+++ b/Doc/library/unittest.mock.rst
@@ -276,7 +276,7 @@
>>> mock.assert_called_once_with('foo', bar='baz')
Traceback (most recent call last):
...
- AssertionError: Expected to be called once. Called 2 times.
+ AssertionError: Expected 'mock' to be called once. Called 2 times.
.. method:: assert_any_call(*args, **kwargs)
@@ -2020,7 +2020,7 @@
>>> mock.assert_called_once_with(1, 2, 3)
Traceback (most recent call last):
...
- AssertionError: Expected to be called once. Called 2 times.
+ AssertionError: Expected 'mock' to be called once. Called 2 times.
Because mocks auto-create attributes on demand, and allow you to call them
with arbitrary arguments, if you misspell one of these assert methods then