44 lines
1.4 KiB
TypeScript
44 lines
1.4 KiB
TypeScript
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import { describe, expect, it } from 'vitest'
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import type { WaveformPoint } from '../types'
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import { resolveWaveformRenderingOptions, selectRenderablePoints } from './rendering'
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describe('waveform rendering selection', () => {
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const points = Array.from({ length: 10_000 }, (_, index): WaveformPoint => ({
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x: index,
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y: index === 5_001 ? 10_000 : Math.sin(index / 20),
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}))
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it('clips to the visible domain and retains one continuity point on each side', () => {
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const selected = selectRenderablePoints(
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points,
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[4_000, 4_100],
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500,
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resolveWaveformRenderingOptions({ downsample: false }),
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)
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expect(selected[0].x).toBe(3_999)
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expect(selected.at(-1)?.x).toBe(4_101)
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})
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it('bounds path density while preserving narrow extrema', () => {
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const selected = selectRenderablePoints(
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points,
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[0, 9_999],
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100,
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resolveWaveformRenderingOptions({ downsampleThreshold: 100, maxPointsPerPixel: 4 }),
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)
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expect(selected.length).toBeLessThanOrEqual(402)
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expect(selected).toContain(points[5_001])
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expect(selected[0]).toBe(points[0])
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expect(selected.at(-1)).toBe(points.at(-1))
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})
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it('normalizes invalid rendering options to stable defaults', () => {
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expect(
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resolveWaveformRenderingOptions({ downsampleThreshold: -1, maxPointsPerPixel: 0 }),
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).toEqual({ downsample: true, downsampleThreshold: 2_000, maxPointsPerPixel: 4 })
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})
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})
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