Add tests and mock data

[gcatanese]

This pull request introduces comprehensive unit tests for the SCA Association Management functionality in the Balance Platform, adds new mock JSON files for test data, and expands test coverage for custom headers in both the Payments and Terminal API services. The changes ensure that serialization/deserialization of requests and responses is validated, custom header handling is thoroughly tested, and the test suite is better organized with realistic mock data.

SCA Association Management Test Coverage:

• Added SCAAssociationManagementTest with tests for deserializing ApproveAssociationRequest, ApproveAssociationResponse, ListAssociationsResponse, and RemoveAssociationRequest using new mock JSON files. This validates that the models correctly map to the expected API payloads. [1] [2] [3] [4] [5]
• Added SCAAssociationManagementServiceTest to verify that the service sends requests with the correct headers, properly handles unauthorized responses, and checks that the service methods are called with expected arguments.

Mock Data Additions:

• Introduced mock JSON files for SCA association requests and responses, which are used in the new and updated tests to simulate real API payloads. [1] [2] [3] [4]

Custom Header Handling Tests:

• Added a test in PaymentsTest to verify that additional custom headers are correctly added and sent with the Payments service requests.
• Added a test in HeaderRequestTest to ensure that additional custom headers can be added to RequestOptions and are stored as expected.

Minor Code Cleanup:

• Cleaned up unused imports in HeaderRequestTest.cs for better maintainability.Description

Tested scenarios

Fixed issue:

[gemini-code-assist]

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