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1import { describe, expect, it } from 'vitest';2import { dhashFromGray, hamming, hostRule, imageKey, nearestWidth, requestHeadersFor } from './images-core';34describe('images-core', () => {5 it('computes a stable dHash and hamming distance', () => {6 const grad = Array.from({ length: 72 }, (_, i) => (i % 9) * 30); // left→right ramp: all bits 07 const h1 = dhashFromGray(grad);8 expect(h1).toBe('0000000000000000');9 const inv = Array.from({ length: 72 }, (_, i) => 255 - (i % 9) * 30);10 const h2 = dhashFromGray(inv);11 expect(h2).toBe('ffffffffffffffff');12 expect(hamming(h1, h2)).toBe(64);13 expect(hamming(h1, h1)).toBe(0);14 });1516 it('applies host rules', () => {17 expect(hostRule('cards.scryfall.io').maxConcurrent).toBe(4);18 const h = requestHeadersFor(new URL('https://storage.googleapis.com/images.pricecharting.com/x/240.jpg'));19 expect(h.referer).toBe('https://www.pricecharting.com/');20 expect(h['user-agent']).toMatch(/RareIndexImageCache/);21 expect(h['user-agent']).not.toBe('node');22 const c = requestHeadersFor(new URL('https://www.comicconnect.com/coverimages/x.jpg'));23 expect(c.referer).toBe('https://www.comicconnect.com/');24 expect(requestHeadersFor(new URL('https://images.ygoprodeck.com/images/cards/1.jpg')).referer).toBeUndefined();25 });2627 it('snaps widths and keys urls', () => {28 expect(nearestWidth(100)).toBe(192);29 expect(nearestWidth(384)).toBe(384);30 expect(nearestWidth(5000)).toBe(1200);31 expect(nearestWidth('abc')).toBe(384);32 expect(imageKey('https://a/b.jpg')).toHaveLength(40);33 expect(imageKey('https://a/b.jpg')).toBe(imageKey('https://a/b.jpg'));34 });35});36