[issue21916] Create unit tests for turtle textonly

[Tim Golden]

Tim Golden added the comment:

@RDM I'm sitting with Greg at a London Python session and we've run through these tests on 3.4/3.5. I know you were reviewing this code at PyCon. Are you happy for me to commit from here?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21916>
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