feat(capital): Add test coverage and client integration for Capital API

[jeandersonbc]

Description

Added comprehensive RSpec test suite for Adyen::Capital services (GrantAccountsApi, GrantOffersApi, GrantsApi).
Integrated the Capital API into the main client by:

• Exposing Adyen::Capital via the client.capital accessor.
• Configuring the service URL (balanceplatform-api) in Adyen::Client#service_url_base.
• Requiring the adyen/services/capital module in adyen-ruby-api-library.rb.

Tested scenarios

Created necessary JSON mock response fixtures under spec/mocks/responses/Capital to facilitate isolated testing. Tests cover all primary API endpoints for retrieving grant accounts, offers, and grants, as well as making grant requests and managing disbursements, ensuring functionality and correct integration.

Fixed issue:

• N/A

[gemini-code-assist]

Summary of Changes

Hello @jeandersonbc, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly expands the Adyen Ruby API library by introducing full support for the Capital API. It enables users to programmatically interact with Capital services, such as managing grant accounts, offers, and grants, through a well-defined client interface. The integration is backed by a comprehensive set of RSpec tests and mock responses, ensuring reliability and ease of use for developers.

Highlights

• Capital API Integration: The Adyen Capital API has been fully integrated into the client library, exposing services like GrantAccountsApi, GrantOffersApi, and GrantsApi via the client.capital accessor.
• Service URL Configuration: The base URL for the Capital API (balanceplatform-api) is now correctly configured within the client's service URL resolution logic.
• Comprehensive Test Coverage: A new RSpec test suite (spec/capital_spec.rb) has been added, covering all primary API endpoints for Capital services, including retrieving accounts, offers, grants, making requests, and managing disbursements.
• Mock Response Fixtures: Dedicated JSON mock response fixtures have been created under spec/mocks/responses/Capital to facilitate robust and isolated testing of the Capital API interactions.

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[gemini-code-assist]

Code Review

This pull request effectively integrates the Adyen Capital API into the client and adds a comprehensive RSpec test suite to ensure its functionality. The implementation is clean and follows the existing patterns in the codebase. My review includes several suggestions for the new test files, focusing on improving maintainability by adhering to RSpec best practices, enhancing code style, and fixing minor formatting issues in the mock JSON responses. Overall, this is a solid contribution.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.7% Duplication on New Code

See analysis details on SonarQube Cloud

[jeandersonbc]

removed the label since this PR is test-related.