add test to handle multiple timeseries for Summary metrics.

[rghetia]

• tests the fix for Fix convertSummaryMetrics #214.

[bogdandrutu]

Can we start using files for the input/output protos? It will be way easier to add/remove tests :) Maybe in a different PR translate all the code defined protos to files?

[codecov-io]

Codecov Report

Merging #220 into master will increase coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage      72%   72.12%   +0.12%     
==========================================
  Files          15       15              
  Lines        1550     1550              
==========================================
+ Hits         1116     1118       +2     
+ Misses        356      355       -1     
+ Partials       78       77       -1

Impacted Files	Coverage Δ
metrics_proto.go	87.68% <0%> (+0.6%)	⬆️

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[rghetia]

Can we start using files for the input/output protos? It will be way easier to add/remove tests :) Maybe in a different PR translate all the code defined protos to files?

sure.