# 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

1. **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()`).

2. **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.

3. **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.