tests: Add integration test for gcs

[Xuanwo]

Signed-off-by: Xuanwo github@xuanwo.io

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[codecov]

Codecov Report

Merging #341 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #341   +/-   ##
=======================================
  Coverage   84.17%   84.17%           
=======================================
  Files          12       12           
  Lines         948      948           
=======================================
  Hits          798      798           
  Misses         91       91           
  Partials       59       59           

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