Add validation to our user model.

Author: macournoyer

models/user.rb

@@ -1,3 +1,3 @@
 class User < NotActiveRecord::Base
-
+  validates :name, :presence => true
 end

not_active_record.rb

@@ -1,7 +1,10 @@
 require "connection_adapter"
+require "active_model"
 
 module NotActiveRecord
   class Base
+    include ActiveModel::Validations
+
     @@connection = SqliteAdapter.new
 
     def initialize(attributes={})

tests/user_test.rb

@@ -41,5 +41,11 @@ def test_columns
   def test_table_name
     assert_equal "users", User.table_name
   end
+
+  def test_valid
+    user = User.new
+    assert ! user.valid?
+    assert_equal ["can't be blank"], user.errors[:name]
+  end
 end