test: remove reliance on old examples/ models

test/common/rc_model.jl

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+import ModelingToolkitStandardLibrary.Electrical as El
+import ModelingToolkitStandardLibrary.Blocks as Bl
+
+@mtkmodel RCModel begin
+    @parameters begin
+        R = 1.0
+        C = 1.0
+        V = 1.0
+    end
+    @components begin
+        resistor = El.Resistor(R = R)
+        capacitor = El.Capacitor(C = C)
+        shape = Bl.Constant(k = V)
+        source = El.Voltage()
+        ground = El.Ground()
+    end
+    @equations begin
+        connect(shape.output, source.V)
+        connect(source.p, resistor.p)
+        connect(resistor.n, capacitor.p)
+        connect(capacitor.n, source.n)
+        connect(capacitor.n, ground.g)
+    end
+end
+
+@named rc_model = RCModel()

test/common/serial_inductor.jl

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+import ModelingToolkitStandardLibrary.Electrical as El
+import ModelingToolkitStandardLibrary.Blocks as Bl
+
+@mtkmodel LLModel begin
+    @components begin
+        shape = Bl.Constant(k = 10.0)
+        source = El.Voltage()
+        resistor = El.Resistor(R = 1.0)
+        inductor1 = El.Inductor(L = 1.0e-2)
+        inductor2 = El.Inductor(L = 2.0e-2)
+        ground = El.Ground()
+    end
+    @equations begin
+        connect(shape.output, source.V)
+        connect(source.p, resistor.p)
+        connect(resistor.n, inductor1.p)
+        connect(inductor1.n, inductor2.p)
+        connect(source.n, inductor2.n)
+        connect(inductor2.n, ground.g)
+    end
+end
+
+@named ll_model = LLModel()
+
+@mtkmodel LL2Model begin
+    @components begin
+        shape = Bl.Constant(k = 10.0)
+        source = El.Voltage()
+        resistor1 = El.Resistor(R = 1.0)
+        resistor2 = El.Resistor(R = 1.0)
+        inductor1 = El.Inductor(L = 1.0e-2)
+        inductor2 = El.Inductor(L = 2.0e-2)
+        ground = El.Ground()
+    end
+    @equations begin
+        connect(shape.output, source.V)
+        connect(source.p, inductor1.p)
+        connect(inductor1.n, resistor1.p)
+        connect(inductor1.n, resistor2.p)
+        connect(resistor1.n, resistor2.n)
+        connect(resistor2.n, inductor2.p)
+        connect(source.n, inductor2.n)
+        connect(inductor2.n, ground.g)
+    end
+end
+
+@named ll2_model = LL2Model()