City-Lifeline-Cockpit/tools/city-massing/primary-area.test.mjs

import test from 'node:test'
import assert from 'node:assert/strict'
import { lineString, multiLineString, polygon } from '@turf/turf'
import {
    PRIMARY_AREA_BOUNDS,
    clipFeatureToBounds,
    isInsidePrimaryArea,
    isWithinPrimaryArea,
} from './primary-area.mjs'

const bounds = [0, 0, 10, 10]

test('the configured primary-area corner coordinates are ordered and finite', () => {
    assert.equal(PRIMARY_AREA_BOUNDS.length, 4)
    assert.ok(PRIMARY_AREA_BOUNDS[0] < PRIMARY_AREA_BOUNDS[2])
    assert.ok(PRIMARY_AREA_BOUNDS[1] < PRIMARY_AREA_BOUNDS[3])
    assert.ok(isInsidePrimaryArea([PRIMARY_AREA_BOUNDS[0], PRIMARY_AREA_BOUNDS[1]]))
})

test('building footprints require complete containment, not just an in-bounds center', () => {
    const crosses = polygon([[[4, 4], [12, 4], [12, 6], [4, 6], [4, 4]]])
    const contained = polygon([[[4, 4], [6, 4], [6, 6], [4, 6], [4, 4]]])
    assert.equal(isWithinPrimaryArea(crosses, bounds), false)
    assert.equal(isWithinPrimaryArea(contained, bounds), true)
})

test('clipFeatureToBounds clips line segments extending outside the primary area', () => {
    const feature = lineString([[-2, 5], [5, 5], [12, 5]], { kind: 'road' })
    const result = clipFeatureToBounds(feature, bounds)
    assert.deepEqual(result.geometry.coordinates, [[0, 5], [5, 5], [10, 5]])
    assert.deepEqual(result.properties, { kind: 'road' })
})

test('clipFeatureToBounds clips multi-line roads to the primary area', () => {
    const feature = multiLineString([[[-1, 2], [3, 2]], [[7, 9], [11, 9]]])
    const result = clipFeatureToBounds(feature, bounds)
    assert.ok(result.geometry.coordinates.flat(1).every(([x, y]) => x >= 0 && x <= 10 && y >= 0 && y <= 10))
})

test('clipFeatureToBounds clips polygon footprints without preserving out-of-area pieces', () => {
    const feature = polygon([[[-2, 2], [5, 2], [5, 8], [-2, 8], [-2, 2]]])
    const result = clipFeatureToBounds(feature, bounds)
    assert.ok(isWithinPrimaryArea(result, bounds))
})

test('clipFeatureToBounds rejects geometry entirely outside the area', () => {
    const feature = lineString([[-4, -4], [-2, -2]])
    assert.equal(clipFeatureToBounds(feature, bounds), null)
})