[EVM] Improve tests

[devbugging]

Closes: #5748

WIP

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 18.18182% with 27 lines in your changes are missing coverage. Please review.

Project coverage is 55.85%. Comparing base (55cf969) to head (1423f05). Report is 11 commits behind head on master.

Files	Patch %	Lines
fvm/evm/types/codeFinder.go	18.75%	26 Missing :warning:
fvm/evm/handler/blockstore.go	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5937      +/-   ##
==========================================
+ Coverage   55.79%   55.85%   +0.06%     
==========================================
  Files        1128     1129       +1     
  Lines       89012    89177     +165     
==========================================
+ Hits        49660    49806     +146     
- Misses      34608    34620      +12     
- Partials     4744     4751       +7     

Flag	Coverage Δ
unittests	55.85% <18.18%> (+0.06%)	:arrow_up:

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