[WIP] more tests, fix cookie handling

[kmike]

No description provided.

[codecov]

Codecov Report

Merging #156 into master will increase coverage by 0.54%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
+ Coverage   90.03%   90.57%   +0.54%     
==========================================
  Files           9        9              
  Lines         572      573       +1     
  Branches      115      115              
==========================================
+ Hits          515      519       +4     
- Misses         29       31       +2     
+ Partials       28       23       -5

Impacted Files	Coverage Δ
scrapy_splash/middleware.py	87.73% <100%> (+2.73%)	⬆️
scrapy_splash/utils.py	89.23% <0%> (-7.7%)	⬇️
scrapy_splash/dupefilter.py	90.9% <0%> (+4.54%)	⬆️

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