add Aqua for QA evals

Author: sjkelly

Project.toml

@@ -7,7 +7,8 @@ version = "0.4.3"
 julia = "1"
 
 [extras]
+Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Test"]
+test = ["Aqua", "Test"]

test/runtests.jl

@@ -1,9 +1,11 @@
 using AbstractTrees, Test
-
+using Aqua
 
 @testset "Builtins" begin include("builtins.jl") end
 @testset "Custom tree types" begin include("trees.jl") end
 if Base.VERSION >= v"1.6"
     # Printing tests use `findall` variants that are not supported on Julia 1.0
     @testset "Printing" begin include("printing.jl") end
 end
+
+Aqua.test_all(AbstractTrees)