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-rw-r--r--activesupport/test/logger_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/test/logger_test.rb b/activesupport/test/logger_test.rb
index 5efbd10a7d..773b0daa1d 100644
--- a/activesupport/test/logger_test.rb
+++ b/activesupport/test/logger_test.rb
@@ -5,6 +5,7 @@ require "multibyte_test_helpers"
require "stringio"
require "fileutils"
require "tempfile"
+require "tmpdir"
require "concurrent/atomics"
class LoggerTest < ActiveSupport::TestCase