Merge pull request #2681 from SciML/ChrisRackauckas-patch-8

Test fixing

Author: ChrisRackauckas

test/interface/dae_initialize_integration.jl

@@ -1,18 +1,18 @@
 using ModelingToolkit, OrdinaryDiffEq, NonlinearSolve, Test
+using ModelingToolkit: D_nounits as D, t_nounits as t
 
-@parameters t g e b
+@parameters g e b
 @variables v(t) w(t) F(t)
-@derivatives D' ~ t
 single_neuron_eqs = [
     D(v) ~ min(max(-2 - v, v), 2 - v) - w + F, # add the flux term
     D(w) ~ e * (v - g * w + b)
 ]
 n1 = ODESystem(single_neuron_eqs, t, [v, w, F], [g, e, b], name = :n1)
 n2 = ODESystem(single_neuron_eqs, t, [v, w, F], [g, e, b], name = :n2)
-@parameters D Dk
-connections = [0 ~ n1.F - D * Dk * max(n1.v - n2.v, 0)
-               0 ~ n2.F - D * max(n2.v - n1.v, 0)]
-connected = ODESystem(connections, t, [], [D, Dk], systems = [n1, n2], name = :connected)
+@parameters Di Dk
+connections = [0 ~ n1.F - Di * Dk * max(n1.v - n2.v, 0)
+               0 ~ n2.F - Di * max(n2.v - n1.v, 0)]
+connected = ODESystem(connections, t, [], [Di, Dk], systems = [n1, n2], name = :connected)
 connected = complete(connected)
 
 u0 = [