Add test to verify correct loading of SQLite extension

test/music_library/repo_test.exs

@@ -0,0 +1,11 @@
+defmodule MusicLibrary.RepoTest do
+  alias MusicLibrary.ReleaseGroupsFixtures
+  use MusicLibrary.DataCase
+
+  describe "correctly loads the unicode extension" do
+    test "unaccent function" do
+      {:ok, result} = MusicLibrary.Repo.query("SELECT unaccent('héllö')")
+      assert [["hello"]] == result.rows
+    end
+  end
+end