Use right method for LogicalExpressionTest

[bgaifullin]

[codecov[bot]]

Codecov Report

Merging #199 into master will increase coverage by 0.09%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #199      +/-   ##
==========================================
+ Coverage   88.82%   88.92%   +0.09%     
==========================================
  Files          71       71              
  Lines        9076     9076              
==========================================
+ Hits         8062     8071       +9     
+ Misses       1014     1005       -9     

Impacted Files	Coverage Δ
test/expressions_test.cpp	97.14% <100.00%> (+12.85%)	:arrow_up:

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