Extract RSS Feed functionality from OStatus

test/web/metadata/feed_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Metadata.Providers.FeedTest do
+  use Pleroma.DataCase
+  import Pleroma.Factory
+  alias Pleroma.Web.Metadata.Providers.Feed
+
+  test "it renders a link to user's atom feed" do
+    user = insert(:user, nickname: "lain")
+
+    assert Feed.build_tags(%{user: user}) == [
+             {:link,
+              [rel: "alternate", type: "application/atom+xml", href: "/users/lain/feed.atom"], []}
+           ]
+  end
+end