negative test for loop.run_until_complete(ClientSession().close()) deprecation warning

[litwisha]

What do these changes do?

Shows that loop.run_until_complete(ClientSession().close()) raises DeprecationWarning.

Related issue number

#2065

Checklist

• I think the code is well written
• Unit tests for the changes exist

[litwisha]

note: repeatable for py35+

[codecov-io]

Codecov Report

Merging #2077 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2077   +/-   ##
=======================================
  Coverage   97.08%   97.08%           
=======================================
  Files          38       38           
  Lines        7689     7689           
  Branches     1344     1344           
=======================================
  Hits         7465     7465           
  Misses        102      102           
  Partials      122      122

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[asvetlov]

Hmm. I cannot reproduce the issue on Python 3.5.3 and 3.6.1, your test doesn't fail.
On other hand we could override _CoroGuard.send() if needed.
Let's discuss it tomorrow offline.

[asvetlov]

Superseded by #2161

[lock]

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