Function assertLoadedExactly

packages/db-collection-e2e/src/utils/assertions.ts:8–34

(
  collection: Collection<T>,
  expectedIds: Array<string>,
  message?: string,
)

 * Assert that a collection has loaded exactly the expected items (no more, no less)
 */
export function assertLoadedExactly<T extends { id: string }>(
  collection: Collection<T>,
  expectedIds: Array<string>,
  message?: string,
) {
  const loadedIds = getLoadedIds(collection)
  const loadedSet = new Set(loadedIds)
  const expectedSet = new Set(expectedIds)

  // Check for extra items
  const extraIds = loadedIds.filter((id) => !expectedSet.has(id))
  if (extraIds.length > 0) {
    throw new Error(
      message ??
        `Collection has extra items: ${extraIds.join(`, `)} (expected only: ${expectedIds.join(`, `)})`,
    )
  }

  // Check for missing items
  const missingIds = expectedIds.filter((id) => !loadedSet.has(id))
  if (missingIds.length > 0) {
    throw new Error(
      message ??
        `Collection is missing items: ${missingIds.join(`, `)} (loaded: ${loadedIds.join(`, `)})`,
    )
  }
}

/**
 * Assert that a collection has loaded at least the expected items (may have more)