Fix: Add more test cases for JSON without indent

[localheinz]

This PR

• adds more test cases for sniffing JSON without indent

[codecov]

Codecov Report

Merging #72 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             master    #72   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity      108    108           
=======================================
  Files            13     13           
  Lines           314    314           
=======================================
  Hits            314    314

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