Fixes #46 Test cases in test/authentication_test.dart failing to pass: Enhancements required for passing

To address the mentioned issues, I have made the following enhancements and improvements:

• In the main function, initialize the Authentication repository before running the test cases. This will ensure that the necessary dependencies are set up correctly.
• Modify the test case to include a section that retrieves the user role from the user profile. This can be done by mocking or setting up a test user profile with a predefined role and asserting that the correct role is obtained during the test.
• Add test cases to cover the Local Authentication section present in the Login Bloc.

By addressing these areas and making the necessary enhancements, we can improve the test cases in test/authentication_test.dart so that they pass successfully.