fix(test): optimize unit test

[lxcmyf]

What does this PR do?
optimize unit test

Why are these changes required?

This PR has been tested by:

• Unit Tests
• Manual Testing

Follow up

Extra details

[codecov-commenter]

Codecov Report

Merging #5169 (73a7419) into release_v4.7.2 (c03451d) will increase coverage by 1.98%.
The diff coverage is 8.33%.

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@@                 Coverage Diff                  @@
##             release_v4.7.2    #5169      +/-   ##
====================================================
+ Coverage             56.98%   58.97%   +1.98%     
- Complexity             8532     8763     +231     
====================================================
  Files                   836      836              
  Lines                 49603    49603              
  Branches               5518     5518              
====================================================
+ Hits                  28265    29252     +987     
+ Misses                19055    18050    -1005     
- Partials               2283     2301      +18     

Impacted Files	Coverage Δ
.../java/org/tron/common/client/WalletGrpcClient.java	0.00% <0.00%> (ø)
...k/src/main/java/org/tron/program/SolidityNode.java	0.00% <0.00%> (ø)
...ava/org/tron/common/client/DatabaseGrpcClient.java	60.00% <50.00%> (+10.00%)	⬆️

... and 133 files with indirect coverage changes

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