Add test cases for giving only body

[nakabonne]

No description provided.

[codecov-io]

Codecov Report

Merging #59 into master will increase coverage by 0.53%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   77.35%   77.87%   +0.53%     
==========================================
  Files           8        8              
  Lines         384      384              
==========================================
+ Hits          297      299       +2     
+ Misses         67       66       -1     
+ Partials       20       19       -1     

Impacted Files	Coverage Δ
main.go	80.91% <0.00%> (+1.82%)	⬆️

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