fix distributed testing setup

Author: ChrisRackauckas

test/downstream/distributed_ensemble.jl

@@ -1,13 +1,19 @@
 using Distributed
 addprocs(2)
 println("There are $(nprocs()) processes")
-@everywhere using OrdinaryDiffEq
 
-@everywhere prob = ODEProblem((u,p,t)->1.01u,0.5,(0.0,1.0))
-@everywhere u0s = [rand()*prob.u0 for i in 1:2]
-@everywhere function prob_func(prob,i,repeat)
-    println("Running trajectory $i")
-    ODEProblem(prob.f,u0s[i],prob.tspan)
+@everywhere begin
+    using Pkg
+    Pkg.activate("downstream")
+    Pkg.develop(PackageSpec(path=joinpath(pwd(), "..")))
+    Pkg.instantiate()
+    using OrdinaryDiffEq
+    prob = ODEProblem((u,p,t)->1.01u,0.5,(0.0,1.0))
+    u0s = [rand()*prob.u0 for i in 1:2]
+    function prob_func(prob,i,repeat)
+        println("Running trajectory $i")
+        ODEProblem(prob.f,u0s[i],prob.tspan)
+    end
 end
 
 ensemble_prob = EnsembleProblem(prob, prob_func=prob_func)