added tests

test/utils_test.exs

@@ -0,0 +1,15 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.UtilsTest do
+  use ExUnit.Case, async: true
+
+  describe "tmp_dir/1" do
+    test "returns unique temporary directory" do
+      {:ok, path} = Pleroma.Utils.tmp_dir("emoji")
+      assert path =~ ~r/\/tmp\/emoji-(.*)-#{:os.getpid()}-(.*)/
+      File.rm_rf(path)
+    end
+  end
+end