Add license header to evaluator_helper_test

Author: linusfromscratch

test/helpers/evaluator_helper_test.rb

@@ -1,5 +1,10 @@
 # frozen_string_literal: true
 
+#  Copyright (c) 2006-2025, Puzzle ITC AG. This file is part of
+#  PuzzleTime and licensed under the Affero General Public License version 3
+#  or later. See the COPYING file at the top-level directory or at
+#  https://github.com/puzzle/puzzletime.
+
 require 'test_helper'
 
 class EvaluatorHelperTest < ActionView::TestCase