1 files changed, 15 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/dup_spec.rb b/spec/ruby/core/integer/dup_spec.rb
new file mode 100644
index 0000000000..214367f0b4
--- /dev/null
+++ b/spec/ruby/core/integer/dup_spec.rb
@@ -0,0 +1,15 @@
+require_relative '../../spec_helper'
+
+ruby_version_is '2.4' do
+  describe "Integer#dup" do
+    it "returns self for small integers" do
+      integer = 1_000
+      integer.dup.should equal(integer)
+    end
+
+    it "returns self for large integers" do
+      integer = 4_611_686_018_427_387_905
+      integer.dup.should equal(integer)
+    end
+  end
+end