1 files changed, 12 insertions, 0 deletions
diff --git a/spec/ruby/core/fixnum/fixnum_spec.rb b/spec/ruby/core/fixnum/fixnum_spec.rb
index 8a050fd25e..7f72f95e94 100644
--- a/spec/ruby/core/fixnum/fixnum_spec.rb
+++ b/spec/ruby/core/fixnum/fixnum_spec.rb
@@ -16,4 +16,16 @@ describe "Fixnum" do
       Fixnum.new
     end.should raise_error(NoMethodError)
   end
+
+  ruby_version_is '2.4' do
+    it "is unified into Integer" do
+      Fixnum.should equal(Integer)
+    end
+
+    it "is deprecated" do
+      -> {
+        Fixnum
+      }.should complain(/constant ::Fixnum is deprecated/)
+    end
+  end
 end