Regression Test Script Rules

These rules apply to every regression test script in tests/ (pytest-based or plain-script style alike).

After every test group / test case

Restore default config values. Any register changed for the test (TPU Debug dataset config, RPU flash config such as Voltage_setting_Q128/Current_setting_Q128, etc.) must be restored to its original value before the script exits. Read the actual value from the unit at setup time (not a hardcoded nominal constant) and write it back on close()/finally, using the device's own config-writable + rewrite flow (wait_until_config_writable() -> write() -> rewrite_config()).
Don't turn off the eload/AC source - just switch back to local. Leaving TPU/RPU powered lets the operator continue on the bench without a fresh power-up sequence. On close, set the voltage back to the bench-safe default (50V or 48V, whichever the test group uses) then call set_local() - never output_off()/disconnect() the supply itself mid-session.
The script must print every step of the test as it runs. Anyone reading the terminal should be able to follow along without reading the code: print before every voltage/current change, every charger enable/disable, every wait, and every register read/write of consequence - not just the final PASS/FAIL.