test: test proper scoping of DelayParentScope during variable discovery

Author: AayushSabharwal

test/variable_scope.jl

@@ -106,12 +106,12 @@ defs = ModelingToolkit.defaults(bar)
 @variables x1(t) x2(t) x3(t) x4(t) x5(t)
 x2 = ParentScope(x2)
 x3 = ParentScope(ParentScope(x3))
-x4 = DelayParentScope(x4, 2)
+x4 = DelayParentScope(x4)
 x5 = GlobalScope(x5)
 @parameters p1 p2 p3 p4 p5
 p2 = ParentScope(p2)
 p3 = ParentScope(ParentScope(p3))
-p4 = DelayParentScope(p4, 2)
+p4 = DelayParentScope(p4)
 p5 = GlobalScope(p5)
 
 @named sys1 = ODESystem([D(x1) ~ p1, D(x2) ~ p2, D(x3) ~ p3, D(x4) ~ p4, D(x5) ~ p5], t)
@@ -126,10 +126,10 @@ p5 = GlobalScope(p5)
 sys3 = sys3 ∘ sys2
 @test length(unknowns(sys3)) == 4
 @test any(isequal(x3), unknowns(sys3))
-@test any(isequal(x4), unknowns(sys3))
+@test any(isequal(ModelingToolkit.renamespace(sys1, x4)), unknowns(sys3))
 @test length(parameters(sys3)) == 4
 @test any(isequal(p3), parameters(sys3))
-@test any(isequal(p4), parameters(sys3))
+@test any(isequal(ModelingToolkit.renamespace(sys1, p4)), parameters(sys3))
 sys4 = complete(sys3)
 @test length(unknowns(sys3)) == 4
 @test length(parameters(sys4)) == 5