1 files changed, 13 insertions, 0 deletions

diff --git a/spec/ruby/core/rational/integer_spec.rb b/spec/ruby/core/rational/integer_spec.rb
new file mode 100644
index 0000000000..cd7fa97fcf
--- /dev/null
+++ b/spec/ruby/core/rational/integer_spec.rb
@@ -0,0 +1,13 @@
+require_relative "../../spec_helper"
+describe "Rational#integer?" do
+  # Guard against the Mathn library
+  guard -> { !defined?(Math.rsqrt) } do
+    it "returns false for a rational with a numerator and no denominator" do
+      Rational(20).integer?.should == false
+    end
+  end
+
+  it "returns false for a rational with a numerator and a denominator" do
+    Rational(20,3).integer?.should == false
+  end
+end