[issue19102] Add tests for CLI of the tabnanny module

[Jaysinh shukla]

Jaysinh shukla <jaysinhp at gmail.com> added the comment:

@vstinner I have created the PR here. I wasn't sure so linked the PR with this issue. Thanks!

PR URL: https://github.com/python/cpython/pull/7699

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue19102>
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