Add test

Author: gdalle

DifferentiationInterface/docs/make.jl

@@ -36,8 +36,8 @@ makedocs(;
         "FAQ" => ["faq/limitations.md", "faq/differentiability.md"],
         "api.md",
         "Development" => [
-            "internals.md",
-            "contributing.md",
+            "dev/internals.md",
+            "dev/contributing.md",
         ],
     ],
     plugins = [links],

DifferentiationInterface/test/Core/Internals/prep.jl

@@ -0,0 +1,13 @@
+using DifferentiationInterface: Prep
+using Test
+
+@test subtypes(Prep) == [
+    DifferentiationInterface.DerivativePrep,
+    DifferentiationInterface.GradientPrep,
+    DifferentiationInterface.HVPPrep,
+    DifferentiationInterface.HessianPrep,
+    DifferentiationInterface.JacobianPrep,
+    DifferentiationInterface.PullbackPrep,
+    DifferentiationInterface.PushforwardPrep,
+    DifferentiationInterface.SecondDerivativePrep,
+]