Add some tests

test/plugs/uploaded_media_plug_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.UploadedMediaPlugTest do
+  use Pleroma.Web.ConnCase
+  alias Pleroma.Upload
+
+  setup_all do
+    File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
+
+    file = %Plug.Upload{
+      content_type: "image/jpg",
+      path: Path.absname("test/fixtures/image_tmp.jpg"),
+      filename: "nice_tf.jpg"
+    }
+
+    {:ok, data} = Upload.store(file)
+    [%{"href" => attachment_url} | _] = data["url"]
+    [attachment_url: attachment_url]
+  end
+
+  test "does not send Content-Disposition header when name param is not set", %{
+    attachment_url: attachment_url
+  } do
+    conn = get(build_conn(), attachment_url)
+    refute Enum.any?(conn.resp_headers, &(elem(&1, 0) == "content-disposition"))
+  end
+
+  test "sends Content-Disposition header when name param is set", %{
+    attachment_url: attachment_url
+  } do
+    conn = get(build_conn(), attachment_url <> "?name=\"cofe\".gif")
+
+    assert Enum.any?(
+             conn.resp_headers,
+             &(&1 == {"content-disposition", "filename=\"\\\"cofe\\\".gif\""})
+           )
+  end
+end