Merge pull request ruby#266 from lucasallan/enumerator-peek

Added specs for Enumerator#peek behaviour.

Author: brixen

optional/capi/enumerator_spec.rb

@@ -25,6 +25,15 @@
           enumerator = @s.rb_enumeratorize(@enumerable, :each, :arg1, :arg2)
           enumerator.class.should == Enumerator
         end
+        
+        it 'raises an exception when the enumerator position is already at the end' do
+          e = 2.times
+          e.peek.should == 0
+          e.next
+          e.peek.should == 1
+          e.next
+          lambda { e.peek }.should raise_error(StopIteration)
+        end
       end
 
       it "enumerates the given object" do