Two Node.js tests that hit the simulation backend WebSocket directly
and inject minimal MicroPython programs via raw-paste REPL:
- test_micropython_i2c_minimal: smallest possible repro. I2C(0)+scan+
single-byte writeto. Used to prove the bug is NOT in the basic I2C
layer — this test passes both before and after the fix.
- test_micropython_i2c_ssd1306_repro: walks the full SSD1306 init
sequence (25-cmd init loop + 6x addr writes + writevto 8B + writevto
1024B). Used to prove the bug is NOT in the cmd sequence or the
writevto path — this test also passes both before and after.
These two tests refuted the original "missing TRANS_DONE IRQ"
hypothesis and pointed the investigation toward the file-load vs
raw-REPL difference, which led to identifying the per-byte _emit
bottleneck in esp32_worker.py.
Run with:
node --experimental-websocket test/test_micropython_i2c_minimal/test.mjs \
--backend=http://localhost:3080 --timeout=120
Requires the velxio container (or local backend with QEMU libs) on
the given backend URL.
David Montero