/**
 * Unit tests for `trackLazy` and `preloadComponent` from `util/lazy.ts`.
 *
 * These utilities wrap React.lazy with a shared module-promise cache keyed by
 * component name.  The cache prevents redundant network requests when the same
 * lazy component mounts, unmounts, and remounts — or when a manual preload
 * races an initial render.
 *
 * Note: React.lazy components can only be *rendered* inside a Suspense
 * boundary, so these tests verify the caching contract and API shape rather
 * than the rendered output.
 */
export {};
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