Add Testing Infrastructure and Test Coverage

[akib22]

Problem

Currently, the repository does not include any tests or test configuration files. This makes it difficult to ensure code reliability, prevent regressions, and increase contributor confidence.

Proposal

• Set up a testing framework (such as Vitest, Testing Library, or another appropriate tool).
• Add sample test cases to validate core functionality.
• Include configuration files and instructions for running tests.

Benefits

• Improved reliability and maintainability of the codebase.
• Easier onboarding for contributors.
• Ability to catch bugs and regressions early.

Additional Notes

Please discuss and suggest preferred testing frameworks, if any, for alignment with project goals.