Worked on enhancing language testing for the oppia-android repository by updating AudioLanguageFragmentTest to use a production-only language configuration, ensuring that test scenarios accurately reflect real-world usage. Leveraged Kotlin and Android development skills to modularize tests with dedicated Bazel targets, improving both organization and CI performance. Added targeted unit tests to validate fallback behavior when unsupported languages, such as Hindi, are encountered, confirming correct defaults to English through ProfileManagementController. Addressed maintainability by restructuring test dependencies and acknowledged local Bazel toolchain issues, relying on CI for validation. The work improved test reliability and laid groundwork for future production-language coverage.