[issue18731] Increased test coverage for uu and telnet

[Alex Volkov]

New submission from Alex Volkov:

Okay,

I'm submitting the patch just for uu / test_uu.

I replaced all try/finally statemets with 'with' context, added try..finally statement for both test cases.

uu.py, line 61 is exposed by test_encode_osstat_assert -- os.stat is duckpunched out of the system, then test case verifies that default permissions(666) is written into a file.

I didn't have try...finally statement because I wasn't sure how the test case will behave when inner try..finally is triggered, so far the tests seem to pass..

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Added file: http://bugs.python.org/file31489/uu_test_v2.patch

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