Merge pull request #102 from ChrisRackauckas-Claude/fix-deprecation-warnings-20260208

Fix deprecation warnings

Author: ChrisRackauckas

test/discrete_tests.jl

@@ -3,7 +3,7 @@ using SimpleDiffEq, Test
 prob = DiscreteProblem(0.5, (0.0, 1.0))
 sol = solve(prob, SimpleFunctionMap())
 
-@test sol[1] == sol[end]
+@test sol.u[1] == sol.u[end]
 
 integrator = init(prob, SimpleFunctionMap())
 step!(integrator)
@@ -14,7 +14,7 @@ step!(integrator)
 prob2 = DiscreteProblem(rand(4, 2), (0.0, 1.0))
 sol = solve(prob2, SimpleFunctionMap())
 
-@test sol[1] == sol[end]
+@test sol.u[1] == sol.u[end]
 
 integrator = init(prob, SimpleFunctionMap())
 step!(integrator)
@@ -25,7 +25,7 @@ step!(integrator)
 prob = DiscreteProblem((u, p, t) -> 1.01u, 0.5, (0.0, 1.0))
 sol = solve(prob, SimpleFunctionMap())
 
-@test sol[end] ≈ 0.505
+@test sol.u[end] ≈ 0.505
 
 integrator = init(prob, SimpleFunctionMap())
 step!(integrator)
@@ -37,7 +37,7 @@ step!(integrator)
 prob = DiscreteProblem((du, u, p, t) -> du .= 1.01 .* u, rand(4, 2), (0.0, 1.0))
 sol = solve(prob, SimpleFunctionMap())
 
-@test sol[end] ./ sol[1] ≈ fill(1.01, 4, 2)
+@test sol.u[end] ./ sol.u[1] ≈ fill(1.01, 4, 2)
 
 integrator = init(prob, SimpleFunctionMap())
 step!(integrator)

test/gpusimpleatsit5_tests.jl

@@ -45,7 +45,7 @@ sol2 = solve(
 )
 sol3 = solve(odeoop, SimpleATsit5(), dt = dt, saveat = 0.0:0.1:100.0)
 
-@test sol[20] ≈ sol2[20] atol = 1.0e-5
+@test sol.u[20] ≈ sol2.u[20] atol = 1.0e-5
 @test sol2.u[20] ≈ sol3.u[20]
 @test sol.t ≈ sol2.t