typo

test/models/validatable_test.rb

@@ -105,7 +105,7 @@ class ValidatableTest < ActiveSupport::TestCase
     assert_equal 'is too long (maximum is 128 characters)', user.errors[:password].join
   end
 
-  test 'shuold not be included in objects with invalid API' do
+  test 'should not be included in objects with invalid API' do
     assert_raise RuntimeError do
       Class.new.send :include, Devise::Models::Validatable
     end