46 lines
1.5 KiB
TypeScript
46 lines
1.5 KiB
TypeScript
import {describe, expect, it} from 'vitest'
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import {
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CENTER_OFFSET,
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VISIBLE_ROWS,
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loopCorrection,
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scrollTopForValueIndex,
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valueIndexFromScroll,
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} from './useInfiniteWheel'
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const H = 40 // itemHeight
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const LEN = 24 // ex. heures
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describe('useInfiniteWheel — math pure', () => {
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it('expose 5 lignes visibles et un offset central de 2', () => {
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expect(VISIBLE_ROWS).toBe(5)
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expect(CENTER_OFFSET).toBe(2)
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})
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it('scrollTopForValueIndex et valueIndexFromScroll font un aller-retour', () => {
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for (const index of [0, 1, 9, 23]) {
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const top = scrollTopForValueIndex(index, H, LEN)
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expect(valueIndexFromScroll(top, H, LEN)).toBe(index)
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}
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})
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it('valueIndexFromScroll boucle en modulo', () => {
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const top = scrollTopForValueIndex(0, H, LEN)
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expect(valueIndexFromScroll(top + LEN * H, H, LEN)).toBe(0)
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})
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it('loopCorrection laisse le scroll de la copie du milieu inchangé', () => {
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const top = scrollTopForValueIndex(12, H, LEN)
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expect(loopCorrection(top, H, LEN)).toBe(top)
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})
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it('loopCorrection ramène vers le milieu quand on dérive vers le haut', () => {
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const drifted = scrollTopForValueIndex(0, H, LEN) - LEN * H
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expect(loopCorrection(drifted, H, LEN)).toBe(drifted + LEN * H)
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})
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it('loopCorrection ramène vers le milieu quand on dérive vers le bas', () => {
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const drifted = scrollTopForValueIndex(0, H, LEN) + LEN * H
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expect(loopCorrection(drifted, H, LEN)).toBe(drifted - LEN * H)
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})
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})
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