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import { describe, expect, test, vi } from "bun:test"
import { createScrollPersistence } from "./layout-scroll"
describe("createScrollPersistence", () => {
test("debounces persisted scroll writes", () => {
vi.useFakeTimers()
try {
const snapshot = {
session: {
review: { x: 0, y: 0 },
},
} as Record<string, Record<string, { x: number; y: number }>>
const writes: Array<Record<string, { x: number; y: number }>> = []
const scroll = createScrollPersistence({
debounceMs: 10,
getSnapshot: (sessionKey) => snapshot[sessionKey],
onFlush: (sessionKey, next) => {
snapshot[sessionKey] = next
writes.push(next)
},
})
for (const i of Array.from({ length: 30 }, (_, n) => n + 1)) {
scroll.setScroll("session", "review", { x: 0, y: i })
}
vi.advanceTimersByTime(9)
expect(writes).toHaveLength(0)
vi.advanceTimersByTime(1)
expect(writes).toHaveLength(1)
expect(writes[0]?.review).toEqual({ x: 0, y: 30 })
scroll.setScroll("session", "review", { x: 0, y: 30 })
vi.advanceTimersByTime(20)
expect(writes).toHaveLength(1)
scroll.dispose()
} finally {
vi.useRealTimers()
}
})
})
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