view data test placeholders

apps/website/tests/view-data/sponsor.test.ts

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+/**
+ * View Data Layer Tests - Sponsor Functionality
+ *
+ * This test file will cover the view data layer for sponsor functionality.
+ *
+ * The view data layer is responsible for:
+ * - DTO → UI model mapping
+ * - Formatting, sorting, and grouping
+ * - Derived fields and defaults
+ * - UI-specific semantics
+ *
+ * This layer isolates the UI from API churn by providing a stable interface
+ * between the API layer and the presentation layer.
+ *
+ * Test coverage will include:
+ * - Sponsor dashboard data transformation and metrics
+ * - Sponsor billing and payment view models
+ * - Campaign management data formatting and status tracking
+ * - League sponsorship data aggregation and tier calculations
+ * - Sponsor settings and configuration view models
+ * - Sponsor signup and onboarding data handling
+ * - Derived sponsor fields (engagement metrics, ROI calculations, etc.)
+ * - Default values and fallbacks for sponsor views
+ * - Sponsor-specific formatting (budgets, impressions, clicks, conversions)
+ * - Data grouping and categorization for sponsor components (by campaign, league, status)
+ * - Sponsor search and filtering view models
+ * - Real-time sponsor metrics and state management
+ * - Historical sponsor performance data transformation
+ */