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-rw-r--r--test/unit/principal_test.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/unit/principal_test.rb b/test/unit/principal_test.rb
index d5c810741..ffcf14fd9 100644
--- a/test/unit/principal_test.rb
+++ b/test/unit/principal_test.rb
@@ -1,4 +1,6 @@
# encoding: utf-8
+# frozen_string_literal: false
+
#
# Redmine - project management software
# Copyright (C) 2006-2017 Jean-Philippe Lang