Add Aqua tests

Project.toml

@@ -35,6 +35,7 @@ StaticArrays = "1.5"
 julia = "1.6"
 
 [extras]
+Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 Calculus = "49dc2e85-a5d0-5ad3-a950-438e2897f1b9"
 DiffTests = "de460e47-3fe3-5279-bb4a-814414816d5d"
 InteractiveUtils = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
@@ -43,4 +44,4 @@ StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Calculus", "DiffTests", "SparseArrays", "StaticArrays", "Test", "InteractiveUtils"]
+test = ["Aqua", "Calculus", "DiffTests", "SparseArrays", "StaticArrays", "Test", "InteractiveUtils"]

test/AquaTest.jl

@@ -0,0 +1,30 @@
+using Test
+using ForwardDiff
+using Aqua
+
+@testset "Aqua tests (performance)" begin
+    # This tests that we don't accidentally run into
+    # https://github.com/JuliaLang/julia/issues/29393
+    ua = Aqua.detect_unbound_args_recursively(ForwardDiff)
+    @test length(ua) == 6
+
+    # See: https://github.com/SciML/OrdinaryDiffEq.jl/issues/1750
+    # Test that we're not introducing method ambiguities across deps
+    ambs = Aqua.detect_ambiguities(ForwardDiff; recursive = true)
+    pkg_match(pkgname, pkdir::Nothing) = false
+    pkg_match(pkgname, pkdir::AbstractString) = occursin(pkgname, pkdir)
+    filter!(x -> pkg_match("ForwardDiff", pkgdir(last(x).module)), ambs)
+
+    @test length(ambs) == 0
+end
+
+@testset "Aqua tests (additional)" begin
+    Aqua.test_undefined_exports(ForwardDiff)
+    Aqua.test_stale_deps(ForwardDiff)
+    Aqua.test_deps_compat(ForwardDiff)
+    Aqua.test_project_extras(ForwardDiff)
+    Aqua.test_project_toml_formatting(ForwardDiff)
+    Aqua.test_piracy(ForwardDiff)
+end
+
+nothing

test/runtests.jl

@@ -51,5 +51,10 @@ Random.seed!(SEED)
         t = @elapsed include("AllocationsTest.jl")
         println("##### done (took $t seconds).")
     end
+    @testset "Aqua" begin
+        println("##### Testing aqua...")
+        t = @elapsed include("AquaTest.jl")
+        println("##### done (took $t seconds).")
+    end
     println("##### Running all ForwardDiff tests took $(time() - t0) seconds.")
 end