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-rw-r--r--test/net/imap/test_imap_response_parser.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/test/net/imap/test_imap_response_parser.rb b/test/net/imap/test_imap_response_parser.rb
index 1612d78..1104a49 100644
--- a/test/net/imap/test_imap_response_parser.rb
+++ b/test/net/imap/test_imap_response_parser.rb
@@ -1,3 +1,6 @@
+#
+# -*- frozen_string_literal: true -*-
+
require "net/imap"
require "test/unit"