Add test for #3515

[mihajenko]

Add test for #3515 (Send custom per-request cookies even if session jar is empty)

What do these changes do?

Adds a test for #3515 bug fix

Are there changes in behavior for the user?

Test suite is updated.

Related issue number

Checklist

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

[codecov-io]

Codecov Report

Merging #3517 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3517      +/-   ##
==========================================
- Coverage   97.94%   97.92%   -0.03%     
==========================================
  Files          44       44              
  Lines        8562     8562              
  Branches     1381     1381              
==========================================
- Hits         8386     8384       -2     
- Misses         71       72       +1     
- Partials      105      106       +1

Impacted Files	Coverage Δ
aiohttp/web_fileresponse.py	96.55% <0%> (-1.15%)	⬇️

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[asvetlov]

Perfect!

[asvetlov]

Thanks!

[lock]

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