Tag

e2e

2 posts

testing

5 min read Jul 11, 2026

The pixel test that passed on the wrong GPU

The same render test passed twice: once at 38.5% painted pixels on real WebGPU, once at 93.6% on a silent WebGL2 fallback the assertion never noticed. Why a designed-in fallback chain turns every green output test ambiguous — until the test also pins which backend produced the frame.

webgpu playwright e2e

testing

4 min read Jul 7, 2026

Offline tile mirrors for deterministic map e2e

Our CI container's browser can't reach the internet, but the final render gate needs a real 117-layer basemap. On mirroring styles, tiles, glyphs and sprites locally — and the traps: SPA fallback serving HTML as tiles, unencoded fontstacks, and settling on signals instead of sleeps.

e2e infrastructure tiles