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-rw-r--r--test/lib/minitest/mock.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/lib/minitest/mock.rb b/test/lib/minitest/mock.rb
index 19acaff68e..07e88113ea 100644
--- a/test/lib/minitest/mock.rb
+++ b/test/lib/minitest/mock.rb
@@ -1,4 +1,5 @@
# encoding: utf-8
+# frozen_string_literal: false
class MockExpectationError < StandardError; end # :nodoc: