Refactor: rename SimDUT, restructure DUT simulation and test flow

tests/test_power_supply.py

@@ -0,0 +1,20 @@
+# tests/test_power_supply.py
+"""
+Basic functional tests for the PowerSupply
+"""
+
+def test_set_and_measure_voltage(power_supply):
+    test_voltage = 5.0
+    power_supply.set_voltage(test_voltage)
+    measured = power_supply.measure_voltage()
+    assert abs(measured - test_voltage) < 0.05
+
+def test_output_toggle(power_supply):
+    power_supply.enable_output(True)
+    # Only works for DummyBackend which keeps state
+    if hasattr(power_supply.comm, "state"):
+        assert power_supply.comm.state["OUTP"] is True
+
+    power_supply.enable_output(False)
+    if hasattr(power_supply.comm, "state"):
+        assert power_supply.comm.state["OUTP"] is False