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Add ForwardDiff dual initialization regression test #4716

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Add ForwardDiff dual initialization regression test #4716

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c74b9f2
Handle ForwardDiff duals in initialization remakes
ChrisRackauckas Jul 8, 2026
c78cc99
Remove unsafe initialization varmap workaround
ChrisRackauckas Jul 10, 2026
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13 changes: 13 additions & 0 deletions lib/ModelingToolkitBase/test/initializationsystem.jl
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Expand Up @@ -1109,6 +1109,19 @@ end
end
end

@testset "ForwardDiff-tagged symbolic constants before initialization remakes" begin
@parameters P
@variables sx(t)
seed_sys = mtkcompile(System([D(sx) ~ P], t, [sx], [P]; name = :seed_sys))

function x_at_1(Pval)
prob = ODEProblem(seed_sys, [sx => Pval, seed_sys.P => Pval], (0.0, 1.0))
return solve(prob, Tsit5())(1.0)
end

@test ForwardDiff.derivative(Pval -> x_at_1(Pval), 1.0) ≈ [2.0]
end

@testset "`remake` changes initialization problem types" begin
@variables _x(..) y(t) z(t)
@parameters p q
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