Unit test review and refactoring

• Acquire Knowledge and Conduct Test Coverage Analysis
         Know how to get test coverage with Jest
          Run Tests and Analyze Coverage Reports. Consider(Plan) writing additional tests to cover these areas to improve the coverage.
• Isolate Unit Tests from Database Connections
          Understand the Importance of Isolation in Unit Testing: Unit tests should be fast, reliable, and independent. Isolating the tests from external dependencies like databases ensures that the tests are not affected by the state of the external system and can run in any environment without requiring a real database connection.
          Refactor Tests to Use Mocks: Modify the existing unit tests to use the mocked database connections. Ensure that the tests verify the behavior of the code under test without actually interacting with the real database.

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