diff --git a/test/symbols.jl b/test/symbols.jl
index 72743bd..bc39c7e 100644
--- a/test/symbols.jl
+++ b/test/symbols.jl
@@ -14,3 +14,7 @@ using Test
 @test ADTypes.Auto(:Tapir) isa AutoTapir
 @test ADTypes.Auto(:Tracker) isa AutoTracker
 @test ADTypes.Auto(:Zygote) isa AutoZygote
+
+@test_throws MethodError ADTypes.Auto(:ThisPackageDoesNotExist)
+@test_throws UndefKeywordError ADTypes.Auto(:ChainRules)
+@test_throws UndefKeywordError ADTypes.Auto(:FiniteDifferences)