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diff --git a/test/pleroma/xml_builder_test.exs b/test/pleroma/xml_builder_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.XmlBuilderTest do
+  use Pleroma.DataCase, async: true
+  alias Pleroma.XmlBuilder
+
+  test "Build a basic xml string from a tuple" do
+    data = {:feed, %{xmlns: "http://www.w3.org/2005/Atom"}, "Some content"}
+
+    expected_xml = "<feed xmlns=\"http://www.w3.org/2005/Atom\">Some content</feed>"
+
+    assert XmlBuilder.to_xml(data) == expected_xml
+  end
+
+  test "returns a complete document" do
+    data = {:feed, %{xmlns: "http://www.w3.org/2005/Atom"}, "Some content"}
+
+    expected_xml =
+      "<?xml version=\"1.0\" encoding=\"UTF-8\"?><feed xmlns=\"http://www.w3.org/2005/Atom\">Some content</feed>"
+
+    assert XmlBuilder.to_doc(data) == expected_xml
+  end
+
+  test "Works without attributes" do
+    data = {
+      :feed,
+      "Some content"
+    }
+
+    expected_xml = "<feed>Some content</feed>"
+
+    assert XmlBuilder.to_xml(data) == expected_xml
+  end
+
+  test "It works with nested tuples" do
+    data = {
+      :feed,
+      [
+        {:guy, "brush"},
+        {:lament, %{configuration: "puzzle"}, "pinhead"}
+      ]
+    }
+
+    expected_xml =
+      ~s[<feed><guy>brush</guy><lament configuration="puzzle">pinhead</lament></feed>]
+
+    assert XmlBuilder.to_xml(data) == expected_xml
+  end
+
+  test "Represents NaiveDateTime as iso8601" do
+    assert XmlBuilder.to_xml(~N[2000-01-01 13:13:33]) == "2000-01-01T13:13:33"
+  end
+
+  test "Uses self-closing tags when no content is giving" do
+    data = {
+      :link,
+      %{rel: "self"}
+    }
+
+    expected_xml = ~s[<link rel="self" />]
+    assert XmlBuilder.to_xml(data) == expected_xml
+  end
+end