Merge pull request #210 from u2/spec_warning

Using the `raise_error` matcher with providing a specific error

Author: dblock

spec/grape_entity/entity_spec.rb

@@ -1133,7 +1133,7 @@ class Parent < Person
       context 'without safe option' do
         it 'throws an exception when an attribute is not found on the object' do
           fresh_class.expose :name, :nonexistent_attribute
-          expect { fresh_class.new(model).serializable_hash }.to raise_error
+          expect { fresh_class.new(model).serializable_hash }.to raise_error NoMethodError
         end
 
         it "exposes attributes that don't exist on the object only when they are generated by a block" do