Review and add missing tests for TransactionStorage methods

[max-sidorov]

No description provided.

[codecov-commenter]

Codecov Report

Merging #597 (c41b325) into master (03123c4) will increase coverage by 0.36%.
The diff coverage is 74.03%.

@@            Coverage Diff             @@
##           master     #597      +/-   ##
==========================================
+ Coverage   61.94%   62.31%   +0.36%     
==========================================
  Files         279      278       -1     
  Lines       12921    12919       -2     
==========================================
+ Hits         8004     8050      +46     
+ Misses       4125     4084      -41     
+ Partials      792      785       -7     

Flag	Coverage Δ
build-test	62.31% <74.03%> (+0.36%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
storage/transaction.go	72.89% <74.03%> (+10.65%)	⬆️
commander/new_block.go	54.30% <0.00%> (+8.06%)	⬆️
commander/workers.go	100.00% <0.00%> (+23.07%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 03123c4...c41b325. Read the comment docs.