unittest.mock: Add __round__ to supported magicmock methods

[mjpieters]

BPO	33516
Nosy	@mjpieters, @vstinner, @voidspace, @ambv, @jreese
PRs	bpo-33516: Add support for __round__ to MagicMock #6880

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-05-22.20:02:10.686>
created_at = <Date 2018-05-15.11:48:12.702>
labels = ['3.8', 'type-feature', 'library']
title = 'unittest.mock:  Add __round__ to supported magicmock methods'
updated_at = <Date 2018-05-22.20:02:10.685>
user = 'https://github.com/mjpieters'

bugs.python.org fields:

activity = <Date 2018-05-22.20:02:10.685>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2018-05-22.20:02:10.686>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2018-05-15.11:48:12.702>
creator = 'mjpieters'
dependencies = []
files = []
hgrepos = []
issue_num = 33516
keywords = ['patch']
message_count = 3.0
messages = ['316641', '317336', '317337']
nosy_count = 5.0
nosy_names = ['mjpieters', 'vstinner', 'michael.foord', 'lukasz.langa', 'jreese']
pr_nums = ['6880']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33516'
versions = ['Python 3.8']

[mjpieters]

I notice that __trunc__, __floor__ and __ceil__ are supported methods for MagicMock, but __round__ (in the same grouping of numeric types emulation methods, see https://docs.python.org/3/reference/datamodel.html#object.\_\_round__), is not.

Please add this to the mapping too.

[vstinner]

New changeset 6c4fab0 by Victor Stinner (John Reese) in branch 'master':
bpo-33516: Add support for __round__ in MagicMock (GH-6880)
6c4fab0

[vstinner]

Thank you Martijn Pieters for the feature request/bug report, and thanks John Reese for the implementation!