test: test @mtkmodel array variables, default namespacing

test/model_parsing.jl

@@ -3,6 +3,7 @@ using ModelingToolkit: get_connector_type, get_defaults, get_gui_metadata,
                        get_systems, get_ps, getdefault, getname, readable_code,
                        scalarize, symtype, VariableDescription, RegularConnector,
                        get_unit
+using SymbolicIndexingInterface
 using URIs: URI
 using Distributions
 using DynamicQuantities, OrdinaryDiffEq
@@ -876,3 +877,26 @@ end
         end),
         false)
 end
+
+@testset "Array parameters and subcomponent defaults" begin
+    @mtkmodel Foo begin
+        @parameters begin
+            p[1:3]
+        end
+    end
+    @mtkmodel Bar begin
+        @parameters begin
+            q[1:3]
+        end
+        @components begin
+            foo = Foo(p = q)
+        end
+    end
+    @named model = Bar()
+    model = complete(model)
+    # non-scalarized versions are parameters
+    @test is_parameter(model, model.q)
+    @test is_parameter(model, model.foo.p)
+    # default is correctly (not) namespaced
+    @test ModelingToolkit.defaults(model)[model.foo.p] == model.q
+end