de790eaceb
- keep 8-row key binning for scroll jitter stability and update the assertion to match runtime behavior
39 lines
933 B
TypeScript
39 lines
933 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({
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atBottom: false,
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bottom: 18,
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pending: 3,
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scrollHeight: 40,
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top: 13,
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viewportHeight: 5
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})
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expect(viewportSnapshotKey(snap)).toBe('0:16:5:40:3')
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})
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})
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