1 files changed, 11 insertions, 2 deletions
diff --git a/spec/ruby/core/rational/to_s_spec.rb b/spec/ruby/core/rational/to_s_spec.rb
index 7d1702b8fa..24e30778e5 100644
--- a/spec/ruby/core/rational/to_s_spec.rb
+++ b/spec/ruby/core/rational/to_s_spec.rb
@@ -1,5 +1,14 @@
-require File.expand_path('../../../shared/rational/to_s', __FILE__)
+require_relative "../../spec_helper"
 
 describe "Rational#to_s" do
-  it_behaves_like(:rational_to_s, :to_s)
+  it "returns a string representation of self" do
+    # Guard against the Mathn library
+    guard -> { !defined?(Math.rsqrt) } do
+      Rational(1, 1).to_s.should == "1/1"
+      Rational(2, 1).to_s.should == "2/1"
+    end
+    Rational(1, 2).to_s.should == "1/2"
+    Rational(-1, 3).to_s.should == "-1/3"
+    Rational(1, -3).to_s.should == "-1/3"
+  end
 end