tests: Address Copilot review on PR #111.

Author: nedseb

lib/wsen-hids/wsen_hids/device.py

@@ -287,7 +287,10 @@ def calibrate_temperature(self, ref_low, measured_low, ref_high, measured_high):
             ref_high: reference temperature at the high point (°C).
             measured_high: sensor reading at the high point (°C).
         """
-        self._temp_gain = float(ref_high - ref_low) / float(measured_high - measured_low)
+        delta = float(measured_high - measured_low)
+        if delta == 0.0:
+            raise ValueError("measured_low and measured_high must differ")
+        self._temp_gain = float(ref_high - ref_low) / delta
         self._temp_offset = float(ref_low) - self._temp_gain * float(measured_low)
 
     # -------------------------------------------------------------------------

tests/runner/executor.py

@@ -154,9 +154,11 @@ def run_action(action, driver_instance):
         return method(*args)
 
     if action_type == "script":
-        local_vars = {"dev": driver_instance}
-        exec(action["script"], {}, local_vars)
-        return local_vars.get("result")
+        script_vars = {"dev": driver_instance, "i2c": driver_instance.i2c}
+        exec(action["script"], script_vars, script_vars)
+        if "result" not in script_vars:
+            raise ValueError("Script must set a 'result' variable")
+        return script_vars["result"]
 
     if action_type == "hardware_script":
         # hardware_script is hardware-only; skip in mock mode