31 lines
940 B
JavaScript
31 lines
940 B
JavaScript
import test from 'node:test'
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import assert from 'node:assert/strict'
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import { getTopMaskProgress } from '../src/utils/homeTopMask.js'
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test('returns 0 before the title reaches the status-bar area', () => {
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assert.equal(
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getTopMaskProgress({ scrollTop: 30, startY: 80, rangeY: 40 }),
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0
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)
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})
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test('ramps linearly through the transition range', () => {
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assert.equal(
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getTopMaskProgress({ scrollTop: 100, startY: 80, rangeY: 40 }),
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0.5
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)
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})
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test('returns 1 after the full transition range', () => {
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assert.equal(
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getTopMaskProgress({ scrollTop: 180, startY: 80, rangeY: 40 }),
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1
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)
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})
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test('clamps invalid values into a stable progress range', () => {
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assert.equal(getTopMaskProgress({ scrollTop: -10, startY: 80, rangeY: 40 }), 0)
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assert.equal(getTopMaskProgress({ scrollTop: 90, startY: 80, rangeY: 0 }), 1)
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assert.equal(getTopMaskProgress({ scrollTop: Number.NaN, startY: 80, rangeY: 40 }), 0)
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})
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