IDLE: Add _utest to textview and add textview tests

[mlouielu]

BPO	30303
Nosy	@terryjreedy, @Mariatta, @mlouielu
PRs	bpo-30303: IDLE: Add _utest argument to textview #1499 bpo-30303: IDLE test_textview: add comments and test; increase coverage to 100% #1641 [3.6] bpo-30303: IDLE test_textview: add comments and test, increase coverage to… #1866 [3.6] bpo-30303: IDLE: Add _utest argument to textview (GH-1499) #1916 [3.6] bpo-30303: IDLE test_textview: add comments and test (GH-1641) #2018

^{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 2017-06-23.02:14:44.969>
created_at = <Date 2017-05-08.07:58:09.865>
labels = ['expert-IDLE', 'type-feature', '3.7']
title = 'IDLE: Add _utest to textview and add textview tests'
updated_at = <Date 2017-06-23.02:14:44.968>
user = 'https://github.com/mlouielu'

bugs.python.org fields:

activity = <Date 2017-06-23.02:14:44.968>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2017-06-23.02:14:44.969>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2017-05-08.07:58:09.865>
creator = 'louielu'
dependencies = []
files = []
hgrepos = []
issue_num = 30303
keywords = []
message_count = 7.0
messages = ['293228', '293895', '293897', '295233', '295234', '295241', '295271']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'Mariatta', 'louielu']
pr_nums = ['1499', '1641', '1866', '1916', '2018']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30303'
versions = ['Python 3.6', 'Python 3.7']

[mlouielu]

Relate to bpo-30290, add _utest to textview to support direct unittest.

[terryjreedy]

New changeset ba365da by terryjreedy (Louie Lu) in branch 'master':
bpo-30303: IDLE: Add _utest argument to textview (bpo-1499)
ba365da

[terryjreedy]

I am adding a couple of exception tests to complete coverage.

[Mariatta]

Louie Lu, are you louisom on GitHub?
Here in the b.p.o it shows that you have signed CLA, indicated with an asterisk next to your username.
Somehow on GitHub the bot could not verify that you've signed it.

Please clarify. Thanks.

[mlouielu]

Mariatta: yes, louisom is my GitHub account. but I migrate to mlouielu this new account. Should I add louisom to b.p.o GitHub account list?

[terryjreedy]

If the bpo profile allows more than one git account, then please add the second one.

[terryjreedy]

New changeset e1a60d9 by terryjreedy (Mariatta) in branch '3.6':
[3.6] bpo-30303: IDLE: Add _utest argument to textview (GH-1499) (bpo-1916)
e1a60d9