[issue21477] Idle: improve idle_test.htest

[Roundup Robot]

Roundup Robot added the comment:

New changeset d7eea8f608c2 by Terry Jan Reedy in branch '3.4':
Issue #21477: Idle htest: modify run; add more tests.
http://hg.python.org/cpython/rev/d7eea8f608c2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21477>
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