sxross/MotionModel — pull request #57 by forrestgrant (2013-06-14 18:28:10+00:00)
Title: Wrote failing test for multiple error messages.

Including a test for validating multiple columns at once
```ruby
it "contains multiple error messages if name and some_float are blank" do
task = ValidatableTask.new(@valid_tasks.except(:name, :some_float))
task.valid?
task.error_messages.length.should == 2
end
```