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6822ee4 747e1c6 6822ee4 747e1c6 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | import { describe, it, expect } from 'vitest'
import sharp from 'sharp'
import { compressImage, validateImage } from './image-processing.js'
async function makeNoiseImageBase64(width: number, height: number, quality = 100): Promise<string> {
const channels = 3
const pixels = Buffer.alloc(width * height * channels)
for (let i = 0; i < pixels.length; i++) pixels[i] = Math.floor(Math.random() * 256)
const buf = await sharp(pixels, { raw: { width, height, channels } }).jpeg({ quality }).toBuffer()
return buf.toString('base64')
}
describe('compressImage', () => {
it('resizes an oversized image down to a 1800px long edge and shrinks its byte size', async () => {
const input = await makeNoiseImageBase64(3000, 2000)
const output = await compressImage(input)
const meta = await sharp(Buffer.from(output, 'base64')).metadata()
expect(Math.max(meta.width ?? 0, meta.height ?? 0)).toBe(1800)
expect(output.length).toBeLessThan(input.length)
})
it('leaves a smaller-than-1800px image unscaled', async () => {
const input = await makeNoiseImageBase64(800, 600)
const output = await compressImage(input)
const meta = await sharp(Buffer.from(output, 'base64')).metadata()
expect(meta.width).toBe(800)
expect(meta.height).toBe(600)
})
it('re-encodes as JPEG regardless of input format', async () => {
const input = await makeNoiseImageBase64(400, 300)
const output = await compressImage(input)
const meta = await sharp(Buffer.from(output, 'base64')).metadata()
expect(meta.format).toBe('jpeg')
})
})
describe('validateImage', () => {
it('resolves for a real, decodable image', async () => {
const input = await makeNoiseImageBase64(100, 100)
await expect(validateImage(input)).resolves.toBeUndefined()
})
it('rejects bytes that are not a decodable image', async () => {
const garbage = Buffer.from('this is not an image').toString('base64')
await expect(validateImage(garbage)).rejects.toThrow()
})
})
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