Improve Code Coverage for RichMetadata

[himsmittal]

Improve Code Coverage for RichMetadata.
Added more test cases.

[codecov]

Codecov Report

Merging #70 into master will increase coverage by 0.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   85.79%   86.12%   +0.32%     
==========================================
  Files         298      298              
  Lines        9760     9760              
  Branches      535      535              
==========================================
+ Hits         8374     8406      +32     
+ Misses       1386     1354      -32

Impacted Files	Coverage Δ
...a/org/apache/spark/sql/types/MetadataWrapper.scala	25% <0%> (+25%)	⬆️
...a/com/salesforce/op/utils/spark/RichMetadata.scala	79.24% <0%> (+54.71%)	⬆️

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[tovbinm]

Lgtm! One minor comment.

[tovbinm]

No need to specify “.type”

[himsmittal]

Done

[tovbinm]

Thanks! Please update your branch from up stream master before next PR.