Test response-middleware in the request_data context tests.

[ashleysommer]

Add an additional step to the request_data context test. This checks if items stored a request.ctx are able to be accessed from a response-middleware after a response is issued.

This is to help debug and reproduce the error described by user verdebirth here: https://community.sanicframework.org/t/issue-with-request-ctx-in-response-middleware/611

[ashleysommer]

Unfortunately even after adding this extra test and running it through our test suite using Tox, I'm still not able to reproduce the error described by verdebirth here: https://community.sanicframework.org/t/issue-with-request-ctx-in-response-middleware/611

[ashleysommer]

Note; linter is failing due to this issue: #1889

[ahopkins]

Placing on hold until #1889 is merged to fix isort

[codecov]

Codecov Report

Merging #1888 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1888   +/-   ##
=======================================
  Coverage   92.07%   92.07%           
=======================================
  Files          27       27           
  Lines        3090     3090           
  Branches      553      553           
=======================================
  Hits         2845     2845           
  Misses        171      171           
  Partials       74       74           

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[ashleysommer]

All tests passed now. Can be merged.