Frontend tests for who-knows-better-quiz component

User Story

As a frontend developer, I want to implement unit tests for the wedding-who-knows-better-quiz component so that we can ensure its stability and correct behavior during interaction with end-users.

Acceptance Criteria

• Create unit tests to verify all quiz operation
• Ensure buttons works correctly
• Mock API source calls where necessary
• Achieve at least 80% test coverage for the component