[issue18365] Idle: mock Text class and test thereof

[Phil Webster]

Phil Webster added the comment:

Using tk.Text for more involved tests sounds good (at least as a start). The pass functions were used to get the FormatParagraph test (#18226) working.

I've been using the same effbot.org site as a reference and haven't found anything more detailed.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18365>
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