test: make initializaton tests runnable from OrdinaryDiffEq

Author: AayushSabharwal

test/runtests.jl

@@ -33,7 +33,6 @@ end
             @safetestset "Dynamic Quantities Test" include("dq_units.jl")
             @safetestset "Unitful Quantities Test" include("units.jl")
             @safetestset "Mass Matrix Test" include("mass_matrix.jl")
-            @safetestset "InitializationSystem Test" include("initializationsystem.jl")
             @safetestset "Guess Propagation" include("guess_propagation.jl")
             @safetestset "Hierarchical Initialization Equations" include("hierarchical_initialization_eqs.jl")
             @safetestset "Reduction Test" include("reduction.jl")
@@ -64,6 +63,10 @@ end
         end
     end
 
+    if GROUP == "All" || GROUP == "InterfaceI" || GROUP == "Initialization"
+            @safetestset "InitializationSystem Test" include("initializationsystem.jl")
+    end
+
     if GROUP == "All" || GROUP == "InterfaceII"
         @testset "InterfaceII" begin
             @safetestset "IndexCache Test" include("index_cache.jl")