tests/snapshot-content-interface: check snapshot behavior

[alfonsosanchezbeato]

Check snapshot behavior when there is a content interface used to share information between two snaps.

This is a reproducer, the test is failing at the moment.

[codecov-commenter]

Codecov Report

Merging #13046 (2b075af) into master (ab6d918) will increase coverage by 0.00%. Report is 1 commits behind head on master. The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master   #13046   +/-   ##
=======================================
  Coverage   78.69%   78.69%           
=======================================
  Files        1001     1001           
  Lines      124324   124324           
=======================================
+ Hits        97832    97834    +2     
+ Misses      20336    20334    -2     
  Partials     6156     6156           

Flag	Coverage Δ
unittests	78.69% <ø> (+<0.01%)	:arrow_up:

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see 4 files with indirect coverage changes

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