diff --git a/test/web/federator_test.exs b/test/web/federator_test.exs
index c709d1181..1d48931b5 100644
--- a/test/web/federator_test.exs
+++ b/test/web/federator_test.exs
@@ -61,4 +61,42 @@ defmodule Pleroma.Web.FederatorTest do
       Pleroma.Config.put([:instance, :allow_relay], true)
     end
   end
+
+  describe "Receive an activity" do
+    test "successfully processes incoming AP docs with correct origin" do
+      params = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "actor" => "http://mastodon.example.org/users/admin",
+        "type" => "Create",
+        "id" => "http://mastodon.example.org/users/admin/activities/1",
+        "object" => %{
+          "type" => "Note",
+          "content" => "hi world!",
+          "id" => "http://mastodon.example.org/users/admin/objects/1",
+          "attributedTo" => "http://mastodon.example.org/users/admin",
+        },
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"]
+      }
+
+      {:ok, _activity} = Federator.handle(:incoming_ap_doc, params)
+    end
+
+    test "rejects incoming AP docs with incorrect origin" do
+      params = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "actor" => "https://niu.moe/users/rye",
+        "type" => "Create",
+        "id" => "http://mastodon.example.org/users/admin/activities/1",
+        "object" => %{
+          "type" => "Note",
+          "content" => "hi world!",
+          "id" => "http://mastodon.example.org/users/admin/objects/1",
+          "attributedTo" => "http://mastodon.example.org/users/admin",
+        },
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"]
+      }
+
+      :error = Federator.handle(:incoming_ap_doc, params)
+    end
+  end
 end