sc_map: add test

[tezc]

No description provided.

[codecov]

Codecov Report

Merging #118 (ff75882) into master (5f921ba) will increase coverage by 0.18%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   99.45%   99.63%   +0.18%     
==========================================
  Files          21       21              
  Lines        2183     2183              
  Branches      386      386              
==========================================
+ Hits         2171     2175       +4     
  Misses          3        3              
+ Partials        9        5       -4     

see 1 file with indirect coverage changes

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