Idle: test startup scripts.

[terryjreedy]

BPO	21473
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 2014-05-12.00:32:12.083>
labels = ['expert-IDLE', 'type-feature', '3.10']
title = 'Idle: test startup scripts.'
updated_at = <Date 2020-06-07.20:48:30.324>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2020-06-07.20:48:30.324>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2014-05-12.00:32:12.083>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 21473
keywords = []
message_count = 1.0
messages = ['218306']
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/issue21473'
versions = ['Python 3.10']

[terryjreedy]

Add test_idle/test_startup to test that Idle starts without obvious error with any of idlelib/idle.(bat, py, pyw). Test should presumably use subprocess. Look at test.support.interactive_python for either direct use or as a model. It in turn uses test.script_helper.spawn_python and .kill_python. Also look at test_cmd_line_script.py for models. A simple sanity check would be requires('gui') test as it should bring (and exit) an actually idle window.

Beyond testing startup with no options, there are multiple options and combinations of options. Some of this could be automated easier if option decoding were separated from acting on the options. If necessary, some things could be added as a non-automated human test.