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-rw-r--r--t/fails-rack-lint.ru1
1 files changed, 1 insertions, 0 deletions
diff --git a/t/fails-rack-lint.ru b/t/fails-rack-lint.ru
index 82bfb5f..8b8b5ec 100644
--- a/t/fails-rack-lint.ru
+++ b/t/fails-rack-lint.ru
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 # This rack app returns an invalid status code, which will cause
 # Rack::Lint to throw an exception if it is present.  This
 # is used to check whether Rack::Lint is in the stack or not.