43 lines
1.3 KiB
TypeScript
43 lines
1.3 KiB
TypeScript
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/**
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* Tests for peakGridCount — the pure pixel-grid peak counter used to normalize
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* each heat layer to the densest cell visible in the current viewport.
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*/
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import { describe, it, expect } from 'vitest'
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import { peakGridCount } from './mapUtils'
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describe('peakGridCount', () => {
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it('returns 1 for empty input (no divide-by-zero)', () => {
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expect(peakGridCount([], 10)).toBe(1)
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})
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it('counts coords sharing a grid cell and returns the peak', () => {
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const coords: Array<[number, number]> = [
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[0, 0],
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[3, 4], // same 10px cell as [0,0]
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[9, 9], // same 10px cell
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[100, 100], // different cell
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]
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expect(peakGridCount(coords, 10)).toBe(3)
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})
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it('separates coords into different cells by cellSize', () => {
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const coords: Array<[number, number]> = [
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[0, 0],
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[10, 0], // next cell over at cellSize 10
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[20, 0], // next again
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]
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expect(peakGridCount(coords, 10)).toBe(1)
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})
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it('a denser cluster yields a larger peak (drives per-layer normalization)', () => {
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const dense: Array<[number, number]> = Array.from({ length: 12 }, () => [5, 5] as [number, number])
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const sparse: Array<[number, number]> = [
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[5, 5],
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[5, 5],
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]
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expect(peakGridCount(dense, 10)).toBe(12)
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expect(peakGridCount(sparse, 10)).toBe(2)
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})
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})
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