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-rw-r--r--actionview/lib/action_view/testing/resolvers.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionview/lib/action_view/testing/resolvers.rb b/actionview/lib/action_view/testing/resolvers.rb
index 68186c3bf8..1fad08a689 100644
--- a/actionview/lib/action_view/testing/resolvers.rb
+++ b/actionview/lib/action_view/testing/resolvers.rb
@@ -22,7 +22,7 @@ module ActionView #:nodoc:
private
def query(path, exts, _, _)
- query = "".dup
+ query = +""
EXTENSIONS.each_key do |ext|
query << "(" << exts[ext].map { |e| e && Regexp.escape(".#{e}") }.join("|") << "|)"
end