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diff --git a/test/pleroma/web/activity_pub/mrf/vocabulary_policy_test.exs b/test/pleroma/web/activity_pub/mrf/vocabulary_policy_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.VocabularyPolicyTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Web.ActivityPub.MRF.VocabularyPolicy
+
+  describe "accept" do
+    setup do: clear_config([:mrf_vocabulary, :accept])
+
+    test "it accepts based on parent activity type" do
+      clear_config([:mrf_vocabulary, :accept], ["Like"])
+
+      message = %{
+        "type" => "Like",
+        "object" => "whatever"
+      }
+
+      {:ok, ^message} = VocabularyPolicy.filter(message)
+    end
+
+    test "it accepts based on child object type" do
+      clear_config([:mrf_vocabulary, :accept], ["Create", "Note"])
+
+      message = %{
+        "type" => "Create",
+        "object" => %{
+          "type" => "Note",
+          "content" => "whatever"
+        }
+      }
+
+      {:ok, ^message} = VocabularyPolicy.filter(message)
+    end
+
+    test "it does not accept disallowed child objects" do
+      clear_config([:mrf_vocabulary, :accept], ["Create", "Note"])
+
+      message = %{
+        "type" => "Create",
+        "object" => %{
+          "type" => "Article",
+          "content" => "whatever"
+        }
+      }
+
+      {:reject, _} = VocabularyPolicy.filter(message)
+    end
+
+    test "it does not accept disallowed parent types" do
+      clear_config([:mrf_vocabulary, :accept], ["Announce", "Note"])
+
+      message = %{
+        "type" => "Create",
+        "object" => %{
+          "type" => "Note",
+          "content" => "whatever"
+        }
+      }
+
+      {:reject, _} = VocabularyPolicy.filter(message)
+    end
+  end
+
+  describe "reject" do
+    setup do: clear_config([:mrf_vocabulary, :reject])
+
+    test "it rejects based on parent activity type" do
+      clear_config([:mrf_vocabulary, :reject], ["Like"])
+
+      message = %{
+        "type" => "Like",
+        "object" => "whatever"
+      }
+
+      {:reject, _} = VocabularyPolicy.filter(message)
+    end
+
+    test "it rejects based on child object type" do
+      clear_config([:mrf_vocabulary, :reject], ["Note"])
+
+      message = %{
+        "type" => "Create",
+        "object" => %{
+          "type" => "Note",
+          "content" => "whatever"
+        }
+      }
+
+      {:reject, _} = VocabularyPolicy.filter(message)
+    end
+
+    test "it passes through objects that aren't disallowed" do
+      clear_config([:mrf_vocabulary, :reject], ["Like"])
+
+      message = %{
+        "type" => "Announce",
+        "object" => "whatever"
+      }
+
+      {:ok, ^message} = VocabularyPolicy.filter(message)
+    end
+  end
+end