[issue30303] IDLE: Add _utest to textview and add textview tests

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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title: IDLE: Add _utest to textview -> IDLE: Add _utest to textview and add textview tests

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30303>
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