diff --git a/.gitignore b/.gitignore
index 6208798..aafb481 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,5 @@
 Manifest.toml
 !test/TestPackage/Manifest.toml
-!test/TestDevDependency/Manifest.toml
 
 *.jlcov
 docs/build/
diff --git a/test/TestDevDependency/src/TestDevDependency.jl b/test/TestDevDependency/src/TestDevDependency.jl
index 51dc1bc..9a0b1aa 100644
--- a/test/TestDevDependency/src/TestDevDependency.jl
+++ b/test/TestDevDependency/src/TestDevDependency.jl
@@ -2,7 +2,4 @@ module TestDevDependency
 
 greet() = print("Hello World!")
 
-struct TestType end
-test_type_error(t::TestType, ::Bool) = true
-
 end # module TestDevDependency
diff --git a/test/TestDevDependency/test_notebook.jl b/test/TestDevDependency/test_notebook.jl
index e749703..d22c269 100644
--- a/test/TestDevDependency/test_notebook.jl
+++ b/test/TestDevDependency/test_notebook.jl
@@ -37,11 +37,7 @@ end
 # ╔═╡ 4b493e7f-78d5-4005-b7c8-630dca053e6b
 TestPackage isa Module || error("TestPackage not loaded correctly")
 
-# ╔═╡ 7af0da90-f7b5-4b36-9964-2154b07f419e
-test_type_error(TestType(), 3)
-
 # ╔═╡ Cell order:
 # ╠═9ff61650-18ef-11ef-165b-13081b75c35f
 # ╠═e9f7421b-9ed0-4f4d-b458-689b301dad5c
 # ╠═4b493e7f-78d5-4005-b7c8-630dca053e6b
-# ╠═7af0da90-f7b5-4b36-9964-2154b07f419e