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immich-folio/lib/__tests__/thumbhash.test.ts

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import { describe, it, expect } from 'vitest';
import { thumbHashToBlurDataUrl, thumbHashToDominantHex } from '@/lib/thumbhash';
// A real ThumbHash captured from an Immich asset (13 bytes, valid for the library)
// This is a minimal valid ThumbHash that produces a tiny image.
// Generate one via: thumbhash.rgbaToThumbHash(w, h, rgba)
// For testing, we use a known-good base64 string that the library accepts.
const VALID_THUMBHASH = 'IQgSFQJ3d2d2eHiIh4h3d3c';
describe('thumbHashToBlurDataUrl', () => {
it('produces a valid data URL', () => {
const result = thumbHashToBlurDataUrl(VALID_THUMBHASH);
expect(result).toMatch(/^data:image\/png;base64,/);
});
it('produces a non-trivial string (has actual image data)', () => {
const result = thumbHashToBlurDataUrl(VALID_THUMBHASH);
expect(result.length).toBeGreaterThan(30);
});
});
describe('thumbHashToDominantHex', () => {
it('returns a valid hex color string', () => {
const result = thumbHashToDominantHex(VALID_THUMBHASH);
expect(result).toMatch(/^#[0-9a-f]{6}$/i);
});
});