Worked on the Adyen/adyen-ios repository to enhance the reliability of the iOS payment workflow by focusing on unit test improvements for the Bizum payment method. Using Swift and iOS development skills, implemented Bizum support within the unit test suite and reorganized test data to address indexing issues that previously caused flaky test failures. This approach stabilized continuous integration runs and improved release readiness by ensuring more consistent test outcomes. The work emphasized clear traceability through explicit commits and targeted test maintenance, demonstrating a methodical approach to reinforcing test coverage and reliability without introducing new features or addressing bug fixes.