update tests for rlp_tx.go

[millken]

Description

Increase test coverage

Fixes #4104

Type of change

Please delete options that are not relevant.

• [] Bug fix (non-breaking change which fixes an issue)
• [] New feature (non-breaking change which adds functionality)
• Code refactor or improvement
• [] Breaking change (fix or feature that would cause a new or changed behavior of existing functionality)
• [] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [] make test
• [] fullsync
• [] Other test (please specify)

Test Configuration:

• Firmware version:
• Hardware:
• Toolchain:
• SDK:

Checklist:

• [] My code follows the style guidelines of this project
• [] I have performed a self-review of my code
• [] I have commented my code, particularly in hard-to-understand areas
• [] I have made corresponding changes to the documentation
• [] My changes generate no new warnings
• [] I have added tests that prove my fix is effective or that my feature works
• [] New and existing unit tests pass locally with my changes
• [] Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.36%. Comparing base (e1f0636) to head (61f6031).
Report is 176 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4145      +/-   ##
==========================================
+ Coverage   75.38%   76.36%   +0.98%     
==========================================
  Files         303      339      +36     
  Lines       25923    28855    +2932     
==========================================
+ Hits        19541    22035    +2494     
- Misses       5360     5718     +358     
- Partials     1022     1102      +80     

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[Liuhaai]

the func name is casual

[sonarcloud]

Quality Gate failed

Failed conditions
20.8% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud