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-rw-r--r--activemodel/test/cases/type/string_test.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activemodel/test/cases/type/string_test.rb b/activemodel/test/cases/type/string_test.rb
index 825c8bb246..5469fdb7af 100644
--- a/activemodel/test/cases/type/string_test.rb
+++ b/activemodel/test/cases/type/string_test.rb
@@ -15,7 +15,7 @@ module ActiveModel
test "cast strings are mutable" do
type = Type::String.new
- s = "foo".dup
+ s = +"foo"
assert_equal false, type.cast(s).frozen?
assert_equal false, s.frozen?