完善建模交互、组件图标与系统协议

tests/test_amesim_signal_components.py

@@ -116,6 +116,32 @@ class AmesimSignalComponentTests(unittest.TestCase):
         self.assertAlmostEqual(valve.opening, 0.75)
         self.assertEqual(resolver.event_times(0.0, 0.2), (0.1,))
 
+    def test_signal_output_can_fan_out_but_input_has_one_driver(self) -> None:
+        network = SimulationNetwork("signal-cardinality")
+        step_1 = AmesimStep0(
+            "step_1", self.medium, initial=0.0, final=0.75, time=0.1
+        )
+        step_2 = AmesimStep0(
+            "step_2", self.medium, initial=1.0, final=0.25, time=0.1
+        )
+        valve_1 = AmesimPnvo001SignalOpening(
+            "valve_1", self.medium, opening0=0.0
+        )
+        valve_2 = AmesimPnvo001SignalOpening(
+            "valve_2", self.medium, opening0=0.0
+        )
+        for component in (step_1, step_2, valve_1, valve_2):
+            network.add_component(component)
+
+        network.connect("step_1", "out", "valve_1", "res")
+        network.connect("step_1", "out", "valve_2", "res")
+        with self.assertRaisesRegex(ValueError, "already has a driver"):
+            network.connect("step_2", "out", "valve_1", "res")
+
+        SignalResolver(network).solve(0.2)
+        self.assertAlmostEqual(valve_1.res.signal, 0.75)
+        self.assertAlmostEqual(valve_2.res.signal, 0.75)
+
     def test_signal_resolver_event_times_are_sorted_and_deduplicated(self) -> None:
         network = SimulationNetwork("signal-events")
         network.add_component(