add test cases for rate_compare_sum()

[wangben718]

No description provided.

[codecov-commenter]

Codecov Report

Merging #44 (adb1c0f) into main (b0b7319) will increase coverage by 16.54%.
The diff coverage is n/a.

❗ Current head adb1c0f differs from pull request most recent head 9fc32a1. Consider uploading reports for the commit 9fc32a1 to get more accurate results

@@            Coverage Diff             @@
##            main      #44       +/-   ##
==========================================
+ Coverage   0.31%   16.86%   +16.54%     
==========================================
  Files         18       18               
  Lines        943      943               
==========================================
+ Hits           3      159      +156     
+ Misses       940      784      -156     

Impacted Files	Coverage Δ
R/rate_compare.R	81.81% <0.00%> (+81.81%)	⬆️
R/rate_compare_sum.R	93.57% <0.00%> (+93.57%)	⬆️
R/prop_test_mn.R	96.42% <0.00%> (+96.42%)	⬆️

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