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-rw-r--r--test/lib/test/unit/testcase.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/lib/test/unit/testcase.rb b/test/lib/test/unit/testcase.rb
index d6ea4fd2b1..10348b5c9b 100644
--- a/test/lib/test/unit/testcase.rb
+++ b/test/lib/test/unit/testcase.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit/assertions'
module Test