1 files changed, 13 insertions, 0 deletions
diff --git a/spec/ruby/core/data/fixtures/classes.rb b/spec/ruby/core/data/fixtures/classes.rb
index ffd361d781..147293ee45 100644
--- a/spec/ruby/core/data/fixtures/classes.rb
+++ b/spec/ruby/core/data/fixtures/classes.rb
@@ -1,6 +1,7 @@
 module DataSpecs
   if Data.respond_to?(:define)
     Measure = Data.define(:amount, :unit)
+    Single = Data.define(:value)
 
     class MeasureWithOverriddenName < Measure
       def self.name
@@ -8,6 +9,12 @@ module DataSpecs
       end
     end
 
+    class SingleWithOverriddenName < Single
+      def self.name
+        "A"
+      end
+    end
+
     class DataSubclass < Data; end
 
     MeasureSubclass = Class.new(Measure) do
@@ -24,5 +31,11 @@ module DataSpecs
         ScratchPad.record [:initialize, rest, kw]
       end
     end
+
+    Area = Data.define(:width, :height, :area) do
+      def initialize(width:, height:)
+        super(width: width, height: height, area: width * height)
+      end
+    end
   end
 end