Test cookie.path_specified == False

[Gallaecio]

@kmike I’m extremely unsure about this change, I have no idea of the side effects it may have.

I am trying to add test coverage to https://codecov.io/gh/scrapy-plugins/scrapy-splash/src/master/scrapy_splash/cookies.py#L111

This change adds such coverage, and ensures that cookie_to_har(har_to_cookie(har_cookie)) == har_cookie works if no path is specified.

On the other hand, setting / as a default path comes from Requests, where it’s still used. Their implementation does have a difference that we lost when we simplified our code: they set path='/' if the path parameter is not received, but if path=None is received that None value is used instead; but I’m not sure if that is relevant to our use case, and it would not make cookie_to_har(har_to_cookie(har_cookie)) == har_cookie work either.

[codecov]

Codecov Report

Merging #245 into master will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #245      +/-   ##
==========================================
+ Coverage   92.67%   92.84%   +0.17%     
==========================================
  Files           9        9              
  Lines         587      587              
  Branches      118      118              
==========================================
+ Hits          544      545       +1     
  Misses         21       21              
+ Partials       22       21       -1

Impacted Files	Coverage Δ
scrapy_splash/cookies.py	100% <ø> (+2.04%)	⬆️

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