Add more tests to locale config

[SasinduDilshara]

Add more tests to locale config

[codecov]

Codecov Report

Attention: Patch coverage is 11.11111% with 8 lines in your changes missing coverage. Please review.

Project coverage is 81.21%. Comparing base (96fe8b4) to head (72a9f41).
Report is 8 commits behind head on development.

Files	Patch %	Lines
...io/ballerina/lib/data/csvdata/utils/Constants.java	0.00%	8 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##             development      #14      +/-   ##
=================================================
+ Coverage          79.50%   81.21%   +1.71%     
  Complexity            57       57              
=================================================
  Files                 19       19              
  Lines               2049     2018      -31     
  Branches             409      401       -8     
=================================================
+ Hits                1629     1639      +10     
+ Misses               251      214      -37     
+ Partials             169      165       -4     

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