1 files changed, 22 insertions, 0 deletions
diff --git a/spec/ruby/library/set/shared/include.rb b/spec/ruby/library/set/shared/include.rb
index d41f8f4102..b4d95cde24 100644
--- a/spec/ruby/library/set/shared/include.rb
+++ b/spec/ruby/library/set/shared/include.rb
@@ -4,4 +4,26 @@ describe :set_include, shared: true do
     set.send(@method, :a).should be_true
     set.send(@method, :e).should be_false
   end
+
+  describe "member equality" do
+    it "is checked using both #hash and #eql?" do
+      obj = Object.new
+      obj_another = Object.new
+
+      def obj.hash; 42 end
+      def obj_another.hash; 42 end
+      def obj_another.eql?(o) hash == o.hash end
+
+      set = Set["a", "b", "c", obj]
+      set.send(@method, obj_another).should == true
+    end
+
+    it "is not checked using #==" do
+      obj = Object.new
+      set = Set["a", "b", "c"]
+
+      obj.should_not_receive(:==)
+      set.send(@method, obj)
+    end
+  end
 end