IDLE: Add test_autocomplete unittests

BPO	30348
Nosy	@terryjreedy, @mlouielu, @miss-islington
PRs	bpo-30348: IDLE: Add fetch completions and get entity unittest #1552 bpo-30348: IDLE: Add test_autocomplete unittest #2209 [3.7] bpo-30348: IDLE: Add test_autocomplete unittest (GH-2209) #12529

^{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 = 'https://github.com/terryjreedy'
closed_at = <Date 2019-03-25.08:09:34.332>
created_at = <Date 2017-05-12.07:55:56.729>
labels = ['expert-IDLE', 'type-feature', '3.7']
title = 'IDLE: Add test_autocomplete unittests'
updated_at = <Date 2019-03-25.08:09:34.331>
user = 'https://github.com/mlouielu'

bugs.python.org fields:

activity = <Date 2019-03-25.08:09:34.331>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2019-03-25.08:09:34.332>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2017-05-12.07:55:56.729>
creator = 'louielu'
dependencies = []
files = []
hgrepos = []
issue_num = 30348
keywords = ['patch']
message_count = 4.0
messages = ['293531', '338769', '338770', '338788']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'louielu', 'miss-islington']
pr_nums = ['1552', '2209', '12529']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30348'
versions = ['Python 3.7']