1 files changed, 5 insertions, 1 deletions
diff --git a/spec/ruby/core/string/to_r_spec.rb b/spec/ruby/core/string/to_r_spec.rb
index 7e1d635d3b..fb7c9d108e 100644
--- a/spec/ruby/core/string/to_r_spec.rb
+++ b/spec/ruby/core/string/to_r_spec.rb
@@ -2,7 +2,7 @@ require_relative '../../spec_helper'
 
 describe "String#to_r" do
   it "returns a Rational object" do
-    String.new.to_r.should be_an_instance_of(Rational)
+    String.new.to_r.should.instance_of?(Rational)
   end
 
   it "returns (0/1) for the empty String" do
@@ -33,6 +33,10 @@ describe "String#to_r" do
     "-20".to_r.should == Rational(-20, 1)
   end
 
+  it "accepts leading plus signs" do
+    "+20".to_r.should == Rational(20, 1)
+  end
+
   it "does not treat a leading period without a numeric prefix as a decimal point" do
     ".9".to_r.should_not == Rational(8106479329266893, 9007199254740992)
   end