32 lines
893 B
TypeScript
32 lines
893 B
TypeScript
import { describe, expect, it } from 'vitest'
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import { getViewportSnapshot, viewportSnapshotKey } from '../lib/viewportStore.js'
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describe('viewportStore', () => {
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it('normalizes absent scroll handles', () => {
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expect(getViewportSnapshot(null)).toEqual({
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atBottom: true,
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bottom: 0,
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pending: 0,
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scrollHeight: 0,
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top: 0,
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viewportHeight: 0
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})
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})
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it('includes pending scroll delta in snapshot math and keying', () => {
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const handle = {
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getPendingDelta: () => 3,
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getScrollHeight: () => 40,
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getScrollTop: () => 10,
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getViewportHeight: () => 5,
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isSticky: () => false
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}
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const snap = getViewportSnapshot(handle as any)
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expect(snap).toMatchObject({ atBottom: false, bottom: 18, pending: 3, scrollHeight: 40, top: 13, viewportHeight: 5 })
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expect(viewportSnapshotKey(snap)).toBe('0:13:5:40:3')
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})
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})
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