AT Mot — a bilingual (EN/FR) daily word game native to the AT Protocol.
Harden PWA tests: guard icon opacity, PNG signature, status-bar tag
author
Jeremy Herve
date
(Jun 23, 2026, 8:02 PM +0200)
commit
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parent
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DECISIONS.md
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DECISIONS.md
···
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Android manual "Add to Home Screen" both work from the manifest alone; the
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proactive Android install banner (which needs a service worker) is forgone on
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purpose. Loading speed is unchanged (CDN + ~94 KB bundle) with no new failure
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modes.
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modes. The regression guard `tests/pwa.test.ts` uses `node:*` imports, so
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`"node"` was added to the shared `tsconfig.json` `types` allowlist — a
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conscious trade-off: Node globals become visible to `src/` typechecking, but
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`noEmit` + Vite bundling mean it can't affect runtime; narrow later by giving
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`tests` its own node-typed project if that boundary is wanted.
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tests/pwa.test.ts
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tests/pwa.test.ts
···
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const root = fileURLToPath(new URL('..', import.meta.url));
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const p = (rel: string) => root + rel;
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const SIG = Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]);
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/** Read width/height from a PNG's IHDR chunk (bytes 16–24, big-endian). */
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function pngSize(path: string): { width: number; height: number } {
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const buf = readFileSync(path);
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if (!buf.subarray(0, 8).equals(SIG)) throw new Error(`${path} is not a PNG`);
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return { width: buf.readUInt32BE(16), height: buf.readUInt32BE(20) };
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}
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/** PNG IHDR color type (byte 25): 2 = RGB (opaque), 6 = RGBA. */
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function pngColorType(path: string): number {
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return readFileSync(path).readUInt8(25);
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}
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describe('PWA icons', () => {
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const { width, height } = pngSize(p(rel));
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expect(width).toBe(size);
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expect(height).toBe(size);
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// Icons must be opaque (flattened onto #0e1116), not RGBA.
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expect(pngColorType(p(rel)), `${rel} has an alpha channel`).toBe(2);
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});
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}
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});
···
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it('declares mobile-web-app capability and iOS app title', () => {
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expect(html).toContain('name="mobile-web-app-capable"');
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expect(html).toContain('name="apple-mobile-web-app-title"');
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expect(html).toContain('name="apple-mobile-web-app-status-bar-style"');
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});
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});