3 files changed, 4 insertions, 4 deletions
diff --git a/activemodel/test/cases/attribute_test.rb b/activemodel/test/cases/attribute_test.rb
index ea2b0efd11..20c02e689c 100644
--- a/activemodel/test/cases/attribute_test.rb
+++ b/activemodel/test/cases/attribute_test.rb
@@ -78,7 +78,7 @@ module ActiveModel
     end
 
     test "duping dups the value" do
-      @type.expect(:deserialize, "type cast".dup, ["a value"])
+      @type.expect(:deserialize, +"type cast", ["a value"])
       attribute = Attribute.from_database(nil, "a value", @type)
 
       value_from_orig = attribute.value
@@ -246,7 +246,7 @@ module ActiveModel
     end
 
     test "with_type preserves mutations" do
-      attribute = Attribute.from_database(:foo, "".dup, Type::Value.new)
+      attribute = Attribute.from_database(:foo, +"", Type::Value.new)
       attribute.value << "1"
 
       assert_equal 1, attribute.with_type(Type::Integer.new).value
diff --git a/activemodel/test/cases/dirty_test.rb b/activemodel/test/cases/dirty_test.rb
index b38d84fff2..0edbbffa86 100644
--- a/activemodel/test/cases/dirty_test.rb
+++ b/activemodel/test/cases/dirty_test.rb
@@ -94,7 +94,7 @@ class DirtyTest < ActiveModel::TestCase
   end
 
   test "attribute mutation" do
-    @model.instance_variable_set("@name", "Yam".dup)
+    @model.instance_variable_set("@name", +"Yam")
     assert_not_predicate @model, :name_changed?
     @model.name.replace("Hadad")
     assert_not_predicate @model, :name_changed?
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?