Add tests

Author: YingboMa

test/model_parsing.jl

@@ -0,0 +1,74 @@
+using ModelingToolkit, Test
+
+@connector RealInput begin u(t), [input = true] end
+@connector RealOutput begin u(t), [output = true] end
+@model Constant begin
+    @components begin output = RealOutput() end
+    @parameters begin k, [description = "Constant output value of block"] end
+    @equations begin output.u ~ k end
+end
+
+@variables t
+D = Differential(t)
+
+@connector Pin begin
+    v(t) = 0                  # Potential at the pin [V]
+    i(t), [connect = Flow]    # Current flowing into the pin [A]
+end
+
+@model OnePort begin
+    @components begin
+        p = Pin()
+        n = Pin()
+    end
+    @variables begin
+        v(t)
+        i(t)
+    end
+    @equations begin
+        v ~ p.v - n.v
+        0 ~ p.i + n.i
+        i ~ p.i
+    end
+end
+
+@model Ground begin
+    @components begin g = Pin() end
+    @equations begin g.v ~ 0 end
+end
+
+@model Resistor begin
+    @extend v, i = oneport = OnePort()
+    @parameters begin R = 1 end
+    @equations begin v ~ i * R end
+end
+
+@model Capacitor begin
+    @extend v, i = oneport = OnePort()
+    @parameters begin C = 1 end
+    @equations begin D(v) ~ i / C end
+end
+
+@model Voltage begin
+    @extend v, i = oneport = OnePort()
+    @components begin V = RealInput() end
+    @equations begin v ~ V.u end
+end
+
+@model RC begin
+    @components begin
+        resistor = Resistor()
+        capacitor = Capacitor()
+        source = Voltage()
+        constant = Constant()
+        ground = Ground()
+    end
+    @equations begin
+        connect(constant.output, source.V)
+        connect(source.p, resistor.p)
+        connect(resistor.n, capacitor.p)
+        connect(capacitor.n, source.n, ground.g)
+    end
+end
+@named rc = RC()
+@test length(equations(structural_simplify(rc))) == 1

test/runtests.jl

@@ -27,6 +27,7 @@ using SafeTestsets, Test
 @safetestset "Reduction Test" begin include("reduction.jl") end
 @safetestset "ODAEProblem Test" begin include("odaeproblem.jl") end
 @safetestset "Components Test" begin include("components.jl") end
+@safetestset "Model Parsing Test" begin include("model_parsing.jl") end
 @safetestset "print_tree" begin include("print_tree.jl") end
 @safetestset "Error Handling" begin include("error_handling.jl") end
 @safetestset "StructuralTransformations" begin include("structural_transformation/runtests.jl") end