Add test of second-order derivative of t -> abs(t)^2 (#650)

JuliaDiff · Jun 9, 2023 · e3670ce · e3670ce
1 parent 50ec9a1
commit e3670ce
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/test/MiscTest.jl b/test/MiscTest.jl
@@ -158,4 +158,7 @@ end
 @test ForwardDiff.derivative(x -> rem2pi(x, RoundUp), rand()) == 1
 @test ForwardDiff.derivative(x -> rem2pi(x, RoundDown), rand()) == 1
 
+# example from https://github.com/JuliaDiff/DiffRules.jl/pull/98#issuecomment-1574420052
+@test only(ForwardDiff.hessian(t -> abs(t[1])^2, [0.0])) == 2
+
 end # module