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diff --git a/spec/ruby/shared/rational/Rational.rb b/spec/ruby/shared/rational/Rational.rb
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+++ b/spec/ruby/shared/rational/Rational.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../../../fixtures/rational', __FILE__)
+
+describe :kernel_Rational, shared: true do
+  describe "passed Integer" do
+    # Guard against the Mathn library
+    conflicts_with :Prime do
+      it "returns a new Rational number with 1 as the denominator" do
+        Rational(1).should eql(Rational(1, 1))
+        Rational(-3).should eql(Rational(-3, 1))
+        Rational(bignum_value).should eql(Rational(bignum_value, 1))
+      end
+    end
+  end
+
+  describe "passed two integers" do
+    it "returns a new Rational number" do
+      rat = Rational(1, 2)
+      rat.numerator.should == 1
+      rat.denominator.should == 2
+      rat.should be_an_instance_of(Rational)
+
+      rat = Rational(-3, -5)
+      rat.numerator.should == 3
+      rat.denominator.should == 5
+      rat.should be_an_instance_of(Rational)
+
+      rat = Rational(bignum_value, 3)
+      rat.numerator.should == bignum_value
+      rat.denominator.should == 3
+      rat.should be_an_instance_of(Rational)
+    end
+
+    it "reduces the Rational" do
+      rat = Rational(2, 4)
+      rat.numerator.should == 1
+      rat.denominator.should == 2
+
+      rat = Rational(3, 9)
+      rat.numerator.should == 1
+      rat.denominator.should == 3
+    end
+  end
+
+  describe "when passed a String" do
+    it "converts the String to a Rational using the same method as String#to_r" do
+      r = Rational(13, 25)
+      s_r = ".52".to_r
+      r_s = Rational(".52")
+
+      r_s.should == r
+      r_s.should == s_r
+    end
+
+    it "scales the Rational value of the first argument by the Rational value of the second" do
+      Rational(".52", ".6").should == Rational(13, 15)
+      Rational(".52", "1.6").should == Rational(13, 40)
+    end
+
+    it "does not use the same method as Float#to_r" do
+      r = Rational(3, 5)
+      f_r = 0.6.to_r
+      r_s = Rational("0.6")
+
+      r_s.should == r
+      r_s.should_not == f_r
+    end
+
+    describe "when passed a Numeric" do
+      it "calls #to_r to convert the first argument to a Rational" do
+        num = RationalSpecs::SubNumeric.new(2)
+
+        Rational(num).should == Rational(2)
+      end
+    end
+
+    describe "when passed a Complex" do
+      it "returns a Rational from the real part if the imaginary part is 0" do
+        Rational(Complex(1, 0)).should == Rational(1)
+      end
+
+      it "raises a RangeError if the imaginary part is not 0" do
+        lambda { Rational(Complex(1, 2)) }.should raise_error(RangeError)
+      end
+    end
+
+    it "raises a TypeError if the first argument is nil" do
+      lambda { Rational(nil) }.should raise_error(TypeError)
+    end
+
+    it "raises a TypeError if the second argument is nil" do
+      lambda { Rational(1, nil) }.should raise_error(TypeError)
+    end
+
+    it "raises a TypeError if the first argument is a Symbol" do
+      lambda { Rational(:sym) }.should raise_error(TypeError)
+    end
+
+    it "raises a TypeError if the second argument is a Symbol" do
+      lambda { Rational(1, :sym) }.should raise_error(TypeError)
+    end
+  end
+end