1 files changed, 19 insertions, 18 deletions
diff --git a/activemodel/test/cases/type/string_test.rb b/activemodel/test/cases/type/string_test.rb
index 7b25a1ef74..222083817e 100644
--- a/activemodel/test/cases/type/string_test.rb
+++ b/activemodel/test/cases/type/string_test.rb
@@ -2,26 +2,27 @@ require "cases/helper"
 require "active_model/type"
 
 module ActiveModel
-  class StringTypeTest < ActiveModel::TestCase
-    test "type casting" do
-      type = Type::String.new
-      assert_equal "t", type.cast(true)
-      assert_equal "f", type.cast(false)
-      assert_equal "123", type.cast(123)
-    end
+  module Type
+    class StringTest < ActiveModel::TestCase
+      test "type casting" do
+        type = Type::String.new
+        assert_equal "t", type.cast(true)
+        assert_equal "f", type.cast(false)
+        assert_equal "123", type.cast(123)
+      end
 
-    test "immutable strings are not duped coming out" do
-      s = "foo"
-      type = Type::ImmutableString.new
-      assert_same s, type.cast(s)
-      assert_same s, type.deserialize(s)
-    end
+      test "cast strings are mutable" do
+        s = "foo"
+        type = Type::String.new
+        assert_equal false, type.cast(s).frozen?
+      end
 
-    test "values are duped coming out" do
-      s = "foo"
-      type = Type::String.new
-      assert_not_same s, type.cast(s)
-      assert_not_same s, type.deserialize(s)
+      test "values are duped coming out" do
+        s = "foo"
+        type = Type::String.new
+        assert_not_same s, type.cast(s)
+        assert_not_same s, type.deserialize(s)
+      end
     end
   end
 end