test: update tests for MTKv9

Author: AayushSabharwal

test/downstream/Project.toml

@@ -15,7 +15,7 @@ Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 [compat]
 BoundaryValueDiffEq = "5"
 ForwardDiff = "0.10"
-ModelingToolkit = "8.37"
+ModelingToolkit = "8.37, 9"
 NonlinearSolve = "2, 3"
 Optimization = "3"
 OptimizationOptimJL = "0.1, 0.2"

test/downstream/integrator_indexing.jl

@@ -236,7 +236,7 @@ integrator[lorenz2.x] = 2.0
 
 # integrator2 = integrator(0.1)
 # @test integrator2 isa Vector
-# @test length(integrator2) == length(states(sys_simplified))
+# @test length(integrator2) == length(unknowns(sys_simplified))
 # @test first(integrator2) isa Real
 
 # integrator3 = integrator(0.0:1.0:10.0, idxs = [lorenz1.x, lorenz2.x])

test/downstream/remake_autodiff.jl

@@ -3,14 +3,14 @@ using OrdinaryDiffEq, ModelingToolkit, Zygote, SciMLSensitivity
 @variables t x(t) o(t)
 D = Differential(t)
 function lotka_volterra(; name = name)
-    states = @variables x(t)=1.0 y(t)=1.0 o(t)
+    unknowns = @variables x(t)=1.0 y(t)=1.0 o(t)
     params = @parameters p1=1.5 p2=1.0 p3=3.0 p4=1.0
     eqs = [
         D(x) ~ p1 * x - p2 * x * y,
         D(y) ~ -p3 * y + p4 * x * y,
         o ~ x * y,
     ]
-    return ODESystem(eqs, t, states, params; name = name)
+    return ODESystem(eqs, t, unknowns, params; name = name)
 end
 
 @named lotka_volterra_sys = lotka_volterra()

test/downstream/solution_interface.jl

@@ -1,4 +1,6 @@
 using ModelingToolkit, OrdinaryDiffEq, RecursiveArrayTools, StochasticDiffEq, Test
+# compat for MTKv8 and v9
+unknowns = isdefined(ModelingToolkit.states) ? ModelingToolkit.states : ModelingToolkit.unknowns
 
 ### Tests on non-layered model (everything should work). ###
 
@@ -78,5 +80,5 @@ prob = ODEProblem(sys_simplified, u0, tspan, p)
 sol = solve(prob, Rodas4())
 
 @test_throws ArgumentError sol[x]
-@test in(sol[lorenz1.x], [getindex.(sol.u, 1) for i in 1:length(states(sol.prob.f.sys))])
+@test in(sol[lorenz1.x], [getindex.(sol.u, 1) for i in 1:length(unknowns(sol.prob.f.sys))])
 @test_throws ArgumentError sol[:x]

test/downstream/symbol_indexing.jl

@@ -1,5 +1,7 @@
 using ModelingToolkit, OrdinaryDiffEq, RecursiveArrayTools, SymbolicIndexingInterface, Test
 using Optimization, OptimizationOptimJL
+# compat for MTKv8 and v9
+unknowns = isdefined(ModelingToolkit.states) ? ModelingToolkit.states : ModelingToolkit.unknowns
 
 @parameters t σ ρ β
 @variables x(t) y(t) z(t)
@@ -122,7 +124,7 @@ sol1 = sol(0.0:1.0:10.0)
 
 sol2 = sol(0.1)
 @test sol2 isa Vector
-@test length(sol2) == length(states(sys_simplified))
+@test length(sol2) == length(unknowns(sys_simplified))
 @test first(sol2) isa Real
 
 sol3 = sol(0.0:1.0:10.0, idxs = [lorenz1.x, lorenz2.x])