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diff --git a/test/pleroma/web/rich_media/backfill_test.exs b/test/pleroma/web/rich_media/backfill_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.RichMedia.BackfillTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Web.RichMedia.Backfill
+  alias Pleroma.Web.RichMedia.Card
+
+  import Mox
+
+  setup_all do: clear_config([:rich_media, :enabled], true)
+
+  test "sets a negative cache entry for an error" do
+    url = "https://bad.example.com/"
+    url_hash = Card.url_to_hash(url)
+
+    Tesla.Mock.mock(fn %{url: ^url} -> :error end)
+
+    Pleroma.CachexMock
+    |> expect(:put, fn :rich_media_cache, ^url_hash, :error, ttl: _ -> {:ok, true} end)
+
+    Backfill.run(%{"url" => url})
+  end
+end