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-rw-r--r--test/lib/minitest/unit.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/lib/minitest/unit.rb b/test/lib/minitest/unit.rb
index e67ca02cd8c..62f89e97e59 100644
--- a/test/lib/minitest/unit.rb
+++ b/test/lib/minitest/unit.rb
@@ -1,4 +1,5 @@
# encoding: utf-8
+# frozen_string_literal: false
require "optparse"
require "rbconfig"