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diff --git a/test/pleroma/web/activity_pub/mrf/inline_quote_policy_test.exs b/test/pleroma/web/activity_pub/mrf/inline_quote_policy_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.InlineQuotePolicyTest do
+  alias Pleroma.Web.ActivityPub.MRF.InlineQuotePolicy
+  use Pleroma.DataCase
+
+  test "adds quote URL to post content" do
+    quote_url = "https://gleasonator.com/objects/1234"
+
+    activity = %{
+      "type" => "Create",
+      "actor" => "https://gleasonator.com/users/alex",
+      "object" => %{
+        "type" => "Note",
+        "content" => "Nice post",
+        "quoteUrl" => quote_url
+      }
+    }
+
+    {:ok, %{"object" => %{"content" => filtered}}} = InlineQuotePolicy.filter(activity)
+
+    assert filtered ==
+             "Nice post<span class=\"quote-inline\"><br/><br/>RT: <a href=\"https://gleasonator.com/objects/1234\">https://gleasonator.com/objects/1234</a></span>"
+  end
+
+  test "doesn't add line breaks to markdown posts" do
+    quote_url = "https://gleasonator.com/objects/1234"
+
+    activity = %{
+      "type" => "Create",
+      "actor" => "https://gleasonator.com/users/alex",
+      "object" => %{
+        "type" => "Note",
+        "content" => "<p>Nice post</p>",
+        "quoteUrl" => quote_url
+      }
+    }
+
+    {:ok, %{"object" => %{"content" => filtered}}} = InlineQuotePolicy.filter(activity)
+
+    assert filtered ==
+             "<p>Nice post<span class=\"quote-inline\"><br/><br/>RT: <a href=\"https://gleasonator.com/objects/1234\">https://gleasonator.com/objects/1234</a></span></p>"
+  end
+
+  test "ignores Misskey quote posts" do
+    object = File.read!("test/fixtures/quote_post/misskey_quote_post.json") |> Jason.decode!()
+
+    activity = %{
+      "type" => "Create",
+      "actor" => "https://misskey.io/users/7rkrarq81i",
+      "object" => object
+    }
+
+    {:ok, filtered} = InlineQuotePolicy.filter(activity)
+    assert filtered == activity
+  end
+
+  test "ignores Fedibird quote posts" do
+    object = File.read!("test/fixtures/quote_post/fedibird_quote_post.json") |> Jason.decode!()
+
+    # Normally the ObjectValidator will fix this before it reaches MRF
+    object = Map.put(object, "quoteUrl", object["quoteURL"])
+
+    activity = %{
+      "type" => "Create",
+      "actor" => "https://fedibird.com/users/noellabo",
+      "object" => object
+    }
+
+    {:ok, filtered} = InlineQuotePolicy.filter(activity)
+    assert filtered == activity
+  end
+
+  test "skips objects which already have an .inline-quote span" do
+    object =
+      File.read!("test/fixtures/quote_post/fedibird_quote_mismatched.json") |> Jason.decode!()
+
+    # Normally the ObjectValidator will fix this before it reaches MRF
+    object = Map.put(object, "quoteUrl", object["quoteUri"])
+
+    activity = %{
+      "type" => "Create",
+      "actor" => "https://fedibird.com/users/noellabo",
+      "object" => object
+    }
+
+    {:ok, filtered} = InlineQuotePolicy.filter(activity)
+    assert filtered == activity
+  end
+end