[issue24279] Update test_base64 to use test.support.script_helper

[Berker Peksag]

Berker Peksag added the comment:

Thanks Christie. I've kept get_output() and changed it to return assert_python_ok().out.

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components: +Tests
resolution:  -> fixed
stage:  -> resolved
status: open -> closed
type:  -> enhancement
versions: +Python 3.6

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<http://bugs.python.org/issue24279>
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