Update test cases to avoid GraalVM build failure

[TharmiganK]

Purpose

$Subject

Related to: ballerina-platform/ballerina-lang#43881

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.44%. Comparing base (b42b932) to head (44d878c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #589   +/-   ##
=========================================
  Coverage     83.44%   83.44%           
  Complexity      228      228           
=========================================
  Files            30       30           
  Lines          1287     1287           
  Branches        180      180           
=========================================
  Hits           1074     1074           
  Misses          170      170           
  Partials         43       43           

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