[issue30290] IDLE: add tests for help_about.py

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Postscript: this test that the retrieved text has at least two lines caught a bug in the new Windows Store python distribution.

    self.assertEqual(printer._Printer__lines[1],
                     dialog._current_textview.textView.get('2.0', '2.end'))

The license file was missing and the backup default had only one line.
#35683, msg333891

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30290>
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