api/core.py test coverage

[nitinawari]

Proposed change

Your PR description goes here.

• close test coverage for api/core.py #991
• Added test coveraege for api/core.py
• 

Type of change

• New core framework functionality
• Bugfix (non-breaking change which fixes an issue)
• Code refactoring without any functionality changes
• New or existing module/payload change
• Localization improvement
• Dependency upgrade
• Documentation improvement
• test coverage

Checklist

• I've followed the contributing guidelines
• I've run make pre-commit, it didn't generate any changes
• I've run make test, all tests passed locally

[nitinawari]

@securestep9 @arkid15r I started writing test cases for each file to reach the maximum test coverage. For this file, I have achieved 100% test coverage. I need a review of the code quality and syntax style so that I can apply the same approach to the other tests.