Ruby on rails 从单元测试调用模型方法

我正在为我的模型添加单元测试，但在对

gem'designe'

提供的用户模型进行测试时遇到问题。这是我的测试代码：

require 'test_helper'

class UserTest < ActiveSupport::TestCase
  test "should not save user without name" do    
    user = User.new

    user.email = "david@test.com"
    user.password = "david123"

    assert !user.save, "Saved user without name"
  end
end

---

显然，designe提供的密码方法没有被调用。运行此测试的正确方法是什么？

刚刚发现问题不在于测试代码，而是我在Fixture for User中为密码设置了一个值

  1) Error:
test_should_not_save_user_without_email(UserTest):
ActiveRecord::StatementInvalid: PG::Error: ERROR:  column "password" of relation "users"  does not exist
LINE 1: INSERT INTO "users" ("name", "email", "password", "created_a...
                                          ^
: INSERT INTO "users" ("name", "email", "password", "created_at", "updated_at", "id") VALUES ('David', 'david@test.com', 'david123', '2012-11-25 17:43:02', '2012-11-25 17:43:02', 127326141)