[issue28572] IDLE: add tests for config dialog.

[Terry J. Reedy]

New submission from Terry J. Reedy:

The current test_configdialog creates an instance of ConfigDialog.  Time to add some real tests so I can comfortably work on multiple other configdialog issues.

  The challenge is to do it so tests run without a blocking mainloop call and without IDLE's tcl update calls.  Explicit root.update call can be added if needed.  I also want to test without making the dialog visible.  This is a problem for at least some event_generate calls, but their seem to be (mostly) better options.  Buttons and Radiobuttons for both tk and ttk have an invoke method that works fine.  Entry widget insert seems to work also to trigger that test action.

Attached are partial tests for two of the four main tabs.

----------
assignee: terry.reedy
files: config_dialog_test.diff
keywords: patch
messages: 279829
nosy: terry.reedy
priority: normal
severity: normal
stage: needs patch
status: open
title: IDLE: add tests for config dialog.
type: enhancement
versions: Python 3.6, Python 3.7
Added file: http://bugs.python.org/file45297/config_dialog_test.diff

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<http://bugs.python.org/issue28572>
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