46 lines
1.6 KiB
TypeScript
46 lines
1.6 KiB
TypeScript
import { cellToChildren, cellToLatLng, latLngToCell } from 'h3-js';
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import { describe, expect, it } from 'vitest';
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import type { HexagonData } from '../types';
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import { findOverlappingMatchingHexagon, hasMatchingHexagonAtResolution } from './h3-selection';
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function hexagonData(h3: string, count: number): HexagonData {
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const [lat, lon] = cellToLatLng(h3);
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return { h3, count, lat, lon };
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}
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describe('h3 selection helpers', () => {
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it('finds a matching higher-resolution hexagon that overlaps the previous hexagon', () => {
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const parent = latLngToCell(51.5, -0.1, 8);
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const children = cellToChildren(parent, 9);
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const selected = findOverlappingMatchingHexagon(
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parent,
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[hexagonData(children[0], 0), hexagonData(children[1], 4)],
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9
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);
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expect(selected?.h3).toBe(children[1]);
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});
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it('rejects candidates that do not overlap or have no matches', () => {
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const parent = latLngToCell(51.5, -0.1, 8);
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const nearbyChild = cellToChildren(parent, 9)[0];
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const distant = latLngToCell(52.2, -0.1, 9);
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expect(
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findOverlappingMatchingHexagon(
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parent,
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[hexagonData(nearbyChild, 0), hexagonData(distant, 12)],
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9
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)
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).toBeNull();
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});
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it('detects when target-resolution matching data is loaded', () => {
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const parent = latLngToCell(51.5, -0.1, 8);
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const child = cellToChildren(parent, 9)[0];
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expect(hasMatchingHexagonAtResolution([hexagonData(child, 1)], 9)).toBe(true);
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expect(hasMatchingHexagonAtResolution([hexagonData(child, 0)], 9)).toBe(false);
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expect(hasMatchingHexagonAtResolution([hexagonData(parent, 1)], 9)).toBe(false);
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});
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});
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