[Draft]some tests

[AITutorials]

[codecov[bot]]

Codecov Report

Merging #856 into master will increase coverage by 0.16%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #856      +/-   ##
==========================================
+ Coverage   76.85%   77.02%   +0.16%     
==========================================
  Files          42       42              
  Lines        2947     2947              
==========================================
+ Hits         2265     2270       +5     
+ Misses        682      677       -5     

Impacted Files	Coverage Δ
torchtext/utils.py	81.50% <100.00%> (ø)
torchtext/vocab.py	90.59% <0.00%> (+1.74%)	:arrow_up:

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