raster.test.ts

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`5a57ebae` 2026-09-07 Pavel Safronov	1	import { readFileSync } from 'node:fs'
	2	import { describe, expect, it } from 'vitest'
	3	import {
	4	RASTER_HEIGHT, RASTER_MAX_HEIGHT_M, RASTER_MIN_HEIGHT_M, RASTER_WIDTH,
	5	} from '../src/views/raster.js'
	6	import { MAP_CUT_WITHOUT_SLATS } from '../src/canon/geometry.js'
	7
	8	const geo = JSON.parse(readFileSync('content/geography.json', 'utf8')) as {
	9	render: {
	10	gridWidth: number; gridHeight: number
	11	minHeightM: number; maxHeightM: number; mapThetaOrigin: number
	12	}
	13	}
	14
	15	/**
	16	* The interior view displaces its shell by the height raster and paints it with the
	17	* colour raster. Both are read as fractions of numbers the app cannot see, so if
	18	* the generator's idea of them ever drifts, the terrain moves or flattens with no
	19	* error anywhere.
	20	*/
	21	describe('raster metadata matches the generator', () => {
	22	it('agrees on the grid', () => {
	23	expect(geo.render.gridWidth).toBe(RASTER_WIDTH)
	24	expect(geo.render.gridHeight).toBe(RASTER_HEIGHT)
	25	})
	26
	27	it('agrees on what black and white mean in the height map', () => {
	28	expect(geo.render.minHeightM).toBe(RASTER_MIN_HEIGHT_M)
	29	expect(geo.render.maxHeightM).toBe(RASTER_MAX_HEIGHT_M)
	30	})
	31
	32	/**
	33	* The range is declared rather than fitted so the raster keeps its meaning as the
	34	* geography is edited. That only works if it actually contains the terrain, so
	35	* check it still does — the generator warns, but nobody watches a build log.
	36	*/
	37	it('still covers the terrain it is meant to cover', () => {
`9a621732` 2026-09-08 Pavel Safronov	38	// The extremes the generator last measured. These are a second line of defence
	39	// and a weak one — they are numbers written down when they were true, not the
	40	// terrain that came out of the most recent run, so they cannot notice the
	41	// geography growing past them. `npm run terrain` now exits non-zero when a
	42	// pixel is clamped, which is the check that actually holds.
	43	expect(RASTER_MIN_HEIGHT_M).toBeLessThanOrEqual(-521)
	44	expect(RASTER_MAX_HEIGHT_M).toBeGreaterThanOrEqual(4381)
`5a57ebae` 2026-09-07 Pavel Safronov	45	})
	46
	47	it('agrees on where the map is cut', () => {
	48	expect(geo.render.mapThetaOrigin).toBeCloseTo(MAP_CUT_WITHOUT_SLATS, 6)
	49	})
	50	})