Use public interface to test internal functions: Part-4

[IndrajeetPatil]

Part of #1692

[AshesITR]

Currently the new tests don't guarantee the .lintr config is found at the expected place, the old ones test for that as well.

[codecov-commenter]

Codecov Report

Merging #1774 (8bb02b8) into main (4aed6d5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1774   +/-   ##
=======================================
  Coverage   98.88%   98.88%           
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  Files         109      109           
  Lines        4653     4653           
=======================================
  Hits         4601     4601           
  Misses         52       52           

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[IndrajeetPatil]

Currently the new tests don't guarantee the .lintr config is found at the expected place, the old ones test for that as well.

Thanks. Added tests to check this as well.