Test keys refactoring

[citramon]

What do these changes do?

Preparing for new release.
Test keys refactoring.

Are there changes in behavior for the user?

Related issue number

Resolvers: 536

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[Dreamsorcerer]

Looks reasonable to me. Thanks.

[codecov]

Codecov Report

Merging #572 (fd03ae8) into master (02782c2) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #572      +/-   ##
==========================================
+ Coverage   98.13%   98.17%   +0.04%     
==========================================
  Files          13       13              
  Lines        1017     1040      +23     
  Branches      140      140              
==========================================
+ Hits          998     1021      +23     
  Misses         15       15              
  Partials        4        4              

Flag	Coverage Δ
unit	98.17% <ø> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiocache/base.py	100.00% <0.00%> (ø)
aiocache/factory.py	100.00% <0.00%> (ø)
aiocache/plugins.py	100.00% <0.00%> (ø)
aiocache/decorators.py	100.00% <0.00%> (ø)
aiocache/backends/memory.py	100.00% <0.00%> (ø)
aiocache/backends/memcached.py	100.00% <0.00%> (ø)
aiocache/backends/redis.py	93.46% <0.00%> (+0.08%)	⬆️

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