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-rw-r--r--test/ripper/test_ripper.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/ripper/test_ripper.rb b/test/ripper/test_ripper.rb
index 13a5294618..ab841b7616 100644
--- a/test/ripper/test_ripper.rb
+++ b/test/ripper/test_ripper.rb
@@ -1,6 +1,7 @@
# frozen_string_literal: true
begin
require 'ripper'
+ require 'stringio'
require 'test/unit'
ripper_test = true
module TestRipper; end