Add tests

Author: YingboMa

test/stream_connectors.jl

@@ -208,3 +208,10 @@ sys = expand_connections(compose(simple, [vp1, vp2, vp3]))
             vp1.v[2] ~ vp3.v[2]
             0 ~ -vp1.i[1] - vp2.i[1] - vp3.i[1]
             0 ~ -vp1.i[2] - vp2.i[2] - vp3.i[2]], by = string)
+
+@connector function VectorHeatPort(; name, N = 100, T0 = 0.0, Q0 = 0.0)
+    @variables (T(t))[1:N]=T0 (Q(t))[1:N]=Q0 [connect = Flow]
+    ODESystem(Equation[], t, [T; Q], []; name = name)
+end
+
+@test_nowarn @named a = VectorHeatPort()