Add tests for more code coverage

[Nageshbansal]

Fixes #1637

[Nageshbansal]

tests for create_socrata_datasets and create_rdataset , increase coverage by ~4%

[codecov]

Codecov Report

Merging #1645 (e2319e6) into main (15a529c) will increase coverage by 4.90%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1645      +/-   ##
==========================================
+ Coverage   60.23%   65.14%   +4.90%     
==========================================
  Files          43       43              
  Lines        4117     4117              
==========================================
+ Hits         2480     2682     +202     
+ Misses       1637     1435     -202     

Impacted Files	Coverage Δ
retriever/lib/engine.py	81.25% <0.00%> (+0.27%)	⬆️
retriever/lib/scripts.py	66.95% <0.00%> (+11.68%)	⬆️
retriever/lib/socrata.py	83.10% <0.00%> (+23.64%)	⬆️
retriever/lib/rdatasets.py	74.80% <0.00%> (+28.24%)	⬆️
retriever/lib/create_scripts.py	46.23% <0.00%> (+31.18%)	⬆️

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[Nageshbansal]

@henrykironde can you please review this PR.

[henrykironde]

This is good, there are some changes that we should make. Let's go through this together when you get free time.

[Nageshbansal]

Yeah sure.
Thanks

[henrykironde]

This is not yet updated as we discussed.