[Improvement][API] add PageInfo UT

[Gallardot]

Purpose of the pull request

Add unit tests to improve code quality and robustness

Brief change log

Verify this pull request

This pull request is code cleanup without any test coverage.

(or)

This pull request is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(or)

If your pull request contain incompatible change, you should also add it to docs/docs/en/guide/upgrede/incompatible.md

[SbloodyS]

LGTM

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.56%. Comparing base (e498116) to head (e722a05).

❗ Current head e722a05 differs from pull request most recent head 7a669b5. Consider uploading reports for the commit 7a669b5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##                dev   #15622   +/-   ##
=========================================
  Coverage     38.56%   38.56%           
- Complexity     4788     4790    +2     
=========================================
  Files          1316     1316           
  Lines         45043    45043           
  Branches       4823     4823           
=========================================
+ Hits          17370    17372    +2     
+ Misses        25781    25780    -1     
+ Partials       1892     1891    -1     

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[sonarcloud]

Quality Gate passed

Issues
5 New issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud