ft add tests for text and markup edit

[abrekhov]

[codecov[bot]]

Codecov Report

Merging #503 (d198e65) into master (4fe428c) will increase coverage by 1.09%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #503      +/-   ##
==========================================
+ Coverage   45.98%   47.07%   +1.09%     
==========================================
  Files           7        7              
  Lines        1555     1555              
==========================================
+ Hits          715      732      +17     
+ Misses        783      766      -17     
  Partials       57       57              

Impacted Files	Coverage Δ
helpers.go	62.34% <0.00%> (+4.23%)	:arrow_up:

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