add a downstream test

Author: ChrisRackauckas

test/downstream/Project.toml

@@ -1,7 +1,9 @@
 [deps]
 ModelingToolkit = "961ee093-0014-501f-94e3-6117800e7a78"
 OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
+Tracker = "9f7883ad-71c0-57eb-9f7f-b5c9e6d3789c"
 
 [compat]
 ModelingToolkit = "8.33"
-OrdinaryDiffEq = "6.31"
+OrdinaryDiffEq = "6.31"
+Tracker = "0.2"

test/downstream/TrackerExt.jl

@@ -0,0 +1,7 @@
+using RecursiveArrayTools, Tracker, Test
+
+x = [5.0]
+a = [Tracker.TrackedArray(x)]
+b = [Tracker.TrackedArray(copy([5.2]))]
+RecursiveArrayTools.recursivecopy!(a,b)
+@test a[1][1] == 5.2

test/runtests.jl

@@ -37,6 +37,7 @@ end
         activate_downstream_env()
         @time @testset "DiffEqArray Indexing Tests" begin include("downstream/symbol_indexing.jl") end
         @time @testset "Event Tests with ArrayPartition" begin include("downstream/downstream_events.jl") end
+        @time @testset "TrackerExt" begin include("downstream/TrackerExt.jl") end
     end
 
     if !is_APPVEYOR && GROUP == "GPU"