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-rw-r--r--actionpack/lib/action_view/test_case.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/test_case.rb b/actionpack/lib/action_view/test_case.rb
index d4f16d4b36..2ce109ea99 100644
--- a/actionpack/lib/action_view/test_case.rb
+++ b/actionpack/lib/action_view/test_case.rb
@@ -169,6 +169,7 @@ module ActionView
INTERNAL_IVARS = %w{
@__name__
+ @__io__
@_assertion_wrapped
@_assertions
@_result