diff --git a/test/project/Extensions/HasDepWithExtensions.jl/src/HasDepWithExtensions.jl b/test/project/Extensions/HasDepWithExtensions.jl/src/HasDepWithExtensions.jl
index d64cbc680e3a5..5c1f2d1f301aa 100644
--- a/test/project/Extensions/HasDepWithExtensions.jl/src/HasDepWithExtensions.jl
+++ b/test/project/Extensions/HasDepWithExtensions.jl/src/HasDepWithExtensions.jl
@@ -4,10 +4,18 @@ using HasExtensions: HasExtensions, HasExtensionsStruct
 using ExtDep: ExtDepStruct
 # Loading ExtDep makes the extension "Extension" load
 
+const m = Base.get_extension(HasExtensions, :Extension)
+m isa Module || error("extension not loaded during precompilation")
+
 function do_something()
     HasExtensions.foo(HasExtensionsStruct()) == 1 || error()
     HasExtensions.foo(ExtDepStruct()) == 2 || error()
     return true
 end
 
+function __init__()
+    m = Base.get_extension(HasExtensions, :Extension)
+    m isa Module || error("extension not loaded during __init__")
+end
+
 end # module