Increase Code Coverage for SharedMemory and ShareableListe

[vinay0410]

BPO	38169
Nosy	@corona10, @vinay0410
PRs	bpo-38169: Increase code coverage for SharedMemory and ShareableList #16139

^{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 2020-07-19.13:36:13.730>
created_at = <Date 2019-09-14.07:44:31.901>
labels = ['tests', '3.9']
title = 'Increase Code Coverage for SharedMemory and ShareableListe'
updated_at = <Date 2020-07-19.13:36:13.730>
user = 'https://github.com/vinay0410'

bugs.python.org fields:

activity = <Date 2020-07-19.13:36:13.730>
actor = 'corona10'
assignee = 'none'
closed = True
closed_date = <Date 2020-07-19.13:36:13.730>
closer = 'corona10'
components = ['Tests']
creation = <Date 2019-09-14.07:44:31.901>
creator = 'vinay0410'
dependencies = []
files = []
hgrepos = []
issue_num = 38169
keywords = ['patch']
message_count = 3.0
messages = ['352420', '373957', '373964']
nosy_count = 2.0
nosy_names = ['corona10', 'vinay0410']
pr_nums = ['16139']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue38169'
versions = ['Python 3.9']

[vinay0410]

Add Tests for SharedMemory and ShareableList. I have also added a check to prevent users from creating shared memory of size 0, because after creating mmap will throw error while memory mapping she of size 0.

[vinay0410]

Remove Check to prevent creating shared_memory with size 0. Will create a different issue for the same.

[corona10]

New changeset bfd0fbd by Vinay Sharma in branch 'master':
bpo-38169: Increase code coverage for SharedMemory and ShareableList (GH-16139)
bfd0fbd