add unit tests for Utils

[gkorland]

No description provided.

[codecov]

Codecov Report

Merging #48 into master will increase coverage by 2.98%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #48      +/-   ##
=========================================
+ Coverage   72.92%   75.9%   +2.98%     
=========================================
  Files          20      20              
  Lines         469     469              
  Branches       72      72              
=========================================
+ Hits          342     356      +14     
+ Misses         99      85      -14     
  Partials       28      28

Impacted Files	Coverage Δ
...main/java/com/redislabs/redisgraph/impl/Utils.java	87.17% <0%> (+35.89%)	⬆️

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