Refactor IDLE htest

[terryjreedy]

BPO	27636
Nosy	@terryjreedy

^{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 = None
created_at = <Date 2016-07-28.03:04:28.032>
labels = ['expert-IDLE', 'type-feature', '3.7']
title = 'Refactor IDLE htest'
updated_at = <Date 2017-07-04.23:46:57.870>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2017-07-04.23:46:57.870>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2016-07-28.03:04:28.032>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 27636
keywords = []
message_count = 2.0
messages = ['271486', '297690']
nosy_count = 1.0
nosy_names = ['terry.reedy']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue27636'
versions = ['Python 3.6', 'Python 3.7']

[terryjreedy]

idlelib.idle_test.htest
Extract a App(Tk) subclass from run function and nested function. Pass that as master instead of bare root. Extract HTest(Toplevel) class with the common code in files with an htest function. Attach HTest to App as an attribute so htest functions can instantiate or subclass.

[terryjreedy]

Htest should extract version from __file__, and module from spec, and display both.