Diff for visually comparing actual with expected in mock.assert_called_with.

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2016-09-09.22:44:33.486>
labels = ['3.8', 'type-feature', 'tests']
title = 'Diff for visually comparing actual with expected in mock.assert_called_with.'
updated_at = <Date 2018-12-11.06:33:15.547>
user = 'https://bugs.python.org/EliRose'

bugs.python.org fields:

activity = <Date 2018-12-11.06:33:15.547>
actor = 'cjw296'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Tests']
creation = <Date 2016-09-09.22:44:33.486>
creator = 'Eli Rose'
dependencies = []
files = ['47982']
hgrepos = []
issue_num = 28054
keywords = ['patch']
message_count = 7.0
messages = ['275481', '279319', '279394', '329636', '329653', '331433', '331583']
nosy_count = 7.0
nosy_names = ['rhettinger', 'cjw296', 'michael.foord', 'asfaltboy', 'Eli Rose', 'mariocj89', 'xtreak']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue28054'
versions = ['Python 3.8']