test: conditionally define component array

Author: ven-k

docs/src/basics/MTKModel_Connector.md

@@ -230,7 +230,7 @@ end
 ```
 
 !!! note
-
+    
     For more examples of usage, checkout [ModelingToolkitStandardLibrary.jl](https://github.com/SciML/ModelingToolkitStandardLibrary.jl/)
 
 ## More on `Model.structure`

src/systems/model_parsing.jl

@@ -844,9 +844,9 @@ function _parse_components!(body, kwargs)
             arg.args[2] = b
             expr = :(@named $arg)
             push!(comp_names, a)
-                if (isa(b.args[1], Symbol) || Meta.isexpr(b.args[1], :.))
+            if (isa(b.args[1], Symbol) || Meta.isexpr(b.args[1], :.))
                 push!(comps, [a, b.args[1]])
-                end
+            end
         end
         _ => error("Couldn't parse the component body: $arg")
     end

test/model_parsing.jl

@@ -680,13 +680,40 @@ end
         :comprehension_2,
         :written_out_for_1,
         :written_out_for_2,
-        :single_sub_component,
+        :single_sub_component
     ]
 
     @test getdefault(component.comprehension_1.sc) == 1
     @test getdefault(component.comprehension_2.sc) == 2
     @test getdefault(component.written_out_for_1.sc) == 2
     @test getdefault(component.written_out_for_2.sc) == 3
+
+    @mtkmodel ConditionalComponent begin
+        @structural_parameters begin
+            N = 2
+        end
+        @components begin
+            if N == 2
+                if_comprehension = [SubComponent(sc = i) for i in 1:N]
+            elseif N == 3
+                elseif_comprehension = [SubComponent(sc = i) for i in 1:N]
+            else
+                else_comprehension = [SubComponent(sc = i) for i in 1:N]
+            end
+        end
+    end
+
+    @named if_component = ConditionalComponent()
+    @test nameof.(get_systems(if_component)) == [:if_comprehension_1, :if_comprehension_2]
+
+    @named elseif_component = ConditionalComponent(; N = 3)
+    @test nameof.(get_systems(elseif_component)) ==
+          [:elseif_comprehension_1, :elseif_comprehension_2, :elseif_comprehension_3]
+
+    @named else_component = ConditionalComponent(; N = 4)
+    @test nameof.(get_systems(else_component)) ==
+          [:else_comprehension_1, :else_comprehension_2,
+        :else_comprehension_3, :else_comprehension_4]
 end
 
 @testset "Parent module of Models" begin