adapter_shared_spec.diff

diff --git a/lib/dm-core/spec/adapter_shared_spec.rb b/lib/dm-core/spec/adapter_shared_spec.rb
index 87c9dd3..e61e301 100644
--- a/lib/dm-core/spec/adapter_shared_spec.rb
+++ b/lib/dm-core/spec/adapter_shared_spec.rb
@@ -90,6 +90,12 @@ share_examples_for 'An Adapter' do
         @heffalump.id.should == id
       end
 
+      it 'should update altered fields' do
+        @heffalump.color = 'violet'
+        @heffalump.save
+        Heffalump.get(@heffalump.id).color.should == 'violet'
+      end
+
       it 'should not alter other fields' do
         color = @heffalump.color
         @heffalump.num_spots = 3