[ISSUE #3828] Code optimization for StandaloneAdminTest and TestUtils

[dr-divago]

Fixes #3828

Motivation

Optimize code in the following classes : StandaloneAdminTest and TestUtils

Modifications

Remove duplication
Use native Boolean.TRUE and Boolean.FALSE instead of variable with value true and false
Use Collections.singletonList for creating List

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable
• If a feature is not applicable for documentation, explain why? Optimization in tests
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 16.34%. Comparing base (713f7c6) to head (35c9589).

Additional details and impacted files

@@              Coverage Diff              @@
##             master    #4784       +/-   ##
=============================================
+ Coverage          0   16.34%   +16.34%     
- Complexity        0     1734     +1734     
=============================================
  Files             0      856      +856     
  Lines             0    31244    +31244     
  Branches          0     2698     +2698     
=============================================
+ Hits              0     5106     +5106     
- Misses            0    25659    +25659     
- Partials          0      479      +479     

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