diff --git a/test/blackbox-tests/test-cases/sites.t/app.ml b/test/blackbox-tests/test-cases/sites.t/app.ml
new file mode 100644
index 00000000000..c7f0afe1a4c
--- /dev/null
+++ b/test/blackbox-tests/test-cases/sites.t/app.ml
@@ -0,0 +1,6 @@
+(* load all the available plugins *)
+let () = Sites.Plugins.Plugins.load_all ()
+
+let () = print_endline "Main app starts..."
+(* Execute the code registered by the plugins *)
+let () = Queue.iter (fun f -> f ()) Registration.todo
diff --git a/test/blackbox-tests/test-cases/sites.t/dune b/test/blackbox-tests/test-cases/sites.t/dune
new file mode 100644
index 00000000000..61eabdda215
--- /dev/null
+++ b/test/blackbox-tests/test-cases/sites.t/dune
@@ -0,0 +1,14 @@
+(executable
+ (public_name app)
+ (modules sites app)
+ (libraries app.register dune-site dune-site.plugins ))
+
+(library
+ (public_name app.register)
+ ;(libraries stdio)
+ (name registration)
+ (modules registration))
+
+(generate_sites_module
+ (module sites)
+ (plugins (app plugins)))
diff --git a/test/blackbox-tests/test-cases/sites.t/dune-project b/test/blackbox-tests/test-cases/sites.t/dune-project
new file mode 100644
index 00000000000..b08e572a086
--- /dev/null
+++ b/test/blackbox-tests/test-cases/sites.t/dune-project
@@ -0,0 +1,8 @@
+(lang dune 2.8)
+(using dune_site 0.1)
+
+(name app)
+
+(package
+ (name app)
+ (sites (lib plugins)))
diff --git a/test/blackbox-tests/test-cases/sites.t/plugin/dune b/test/blackbox-tests/test-cases/sites.t/plugin/dune
new file mode 100644
index 00000000000..ad158e0fbcd
--- /dev/null
+++ b/test/blackbox-tests/test-cases/sites.t/plugin/dune
@@ -0,0 +1,12 @@
+(env (_ (flags -w -33)))
+
+(library
+ (public_name plugin1.plugin1_impl)
+ (name plugin1_impl)
+ (modules plugin1_impl)
+ (libraries app.MyControls app.register threads))
+
+(plugin
+ (name plugin1)
+ (libraries threads plugin1.plugin1_impl)
+ (site (app plugins)))
diff --git a/test/blackbox-tests/test-cases/sites.t/plugin/dune-project b/test/blackbox-tests/test-cases/sites.t/plugin/dune-project
new file mode 100644
index 00000000000..9bc1d092732
--- /dev/null
+++ b/test/blackbox-tests/test-cases/sites.t/plugin/dune-project
@@ -0,0 +1,7 @@
+(lang dune 2.8)
+(using dune_site 0.1)
+
+(generate_opam_files true)
+
+(package
+ (name plugin1))
diff --git a/test/blackbox-tests/test-cases/sites.t/plugin/plugin1.opam b/test/blackbox-tests/test-cases/sites.t/plugin/plugin1.opam
new file mode 100644
index 00000000000..a295589bbd6
--- /dev/null
+++ b/test/blackbox-tests/test-cases/sites.t/plugin/plugin1.opam
@@ -0,0 +1,20 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+depends: [
+  "dune" {>= "2.8"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
diff --git a/test/blackbox-tests/test-cases/sites.t/plugin/plugin1_impl.ml b/test/blackbox-tests/test-cases/sites.t/plugin/plugin1_impl.ml
new file mode 100644
index 00000000000..b9499c6436c
--- /dev/null
+++ b/test/blackbox-tests/test-cases/sites.t/plugin/plugin1_impl.ml
@@ -0,0 +1,4 @@
+let () =
+  let open Thread in
+  print_endline "Registration of Plugin1";
+  Queue.add (fun () -> print_endline "Plugin1 is doing something...") Registration.todo
diff --git a/test/blackbox-tests/test-cases/sites.t/registration.ml b/test/blackbox-tests/test-cases/sites.t/registration.ml
new file mode 100644
index 00000000000..ed989a47c92
--- /dev/null
+++ b/test/blackbox-tests/test-cases/sites.t/registration.ml
@@ -0,0 +1 @@
+let todo : (unit -> unit) Queue.t = Queue.create ()
diff --git a/test/blackbox-tests/test-cases/sites.t/run.t b/test/blackbox-tests/test-cases/sites.t/run.t
new file mode 100644
index 00000000000..174ce491e26
--- /dev/null
+++ b/test/blackbox-tests/test-cases/sites.t/run.t
@@ -0,0 +1,5 @@
+
+  $ dune build ./app.exe @install
+  $ dune exec ./app.exe
+
+
diff --git a/test/blackbox-tests/test-cases/sites.t/stubs/MyControls.ml b/test/blackbox-tests/test-cases/sites.t/stubs/MyControls.ml
new file mode 100644
index 00000000000..8d1c8b69c3f
--- /dev/null
+++ b/test/blackbox-tests/test-cases/sites.t/stubs/MyControls.ml
@@ -0,0 +1 @@
+ 
diff --git a/test/blackbox-tests/test-cases/sites.t/stubs/dune b/test/blackbox-tests/test-cases/sites.t/stubs/dune
new file mode 100644
index 00000000000..c834c74867e
--- /dev/null
+++ b/test/blackbox-tests/test-cases/sites.t/stubs/dune
@@ -0,0 +1,7 @@
+(library
+ (public_name app.MyControls)
+ (name MyControls)
+
+ (modules MyControls)
+ (libraries )
+)