Rails 3.1 Rspec 为模型创建测试用例验证字段 [英] Rails 3.1 Rspec Creating test case validate field for Model

问题描述

我正在尝试为用户模型创建一个测试用例.基本上，它将验证 first_name 和 last_name 是否存在.

I'm trying to create a test case for User model. Basically, it will validate first_name and last_name to be present.

我要做的是检查特定字段上的错误是否为空，并且应该为空.但是它总是失败.

What I am trying to do is to check whether the error on a specific field is empty or not and it should be empty. However it always fails.

这样做的正确方法是什么?

What is the correct way to do this?

这是我的代码

在我的 user_spec.rb 上

On my user_spec.rb

require 'spec_helper'

describe User do

  before do
    @user = User.new
  end

  it "must have a first name" do
    @user.errors[:first_name].should_not be_empty
  end

  it "must have a last name" do
    @user.errors[:last_name].should_not be_empty
  end
end

在我的 user.rb 文件中

On my user.rb file

class User < ActiveRecord::Base
  validates :first_name, :presence => true
  validates :last_name, :presence => true
end

推荐答案

RSpec 支持隐式"主题的概念.如果describe"块的第一个参数是一个类，RSpec 会自动使该类的实例可用于您的规范.请参阅 http://relishapp.com/rspec/rspec-core/v/2-6/dir/subject/implicit-subject.

RSpec supports the notion of an "implicit" subject. If your first argument to the "describe" block is a class, RSpec automatically makes an instance of that class available to your specs. See http://relishapp.com/rspec/rspec-core/v/2-6/dir/subject/implicit-subject.

require 'spec_helper'

describe User do

  it "must have a first name" do    
    subject.should have(1).error_on(:first_name)
  end

  it "must have a last name" do
    subject.should have(1).error_on(:last_name)
  end
end

导致 RSpec 输出(如果使用 --format 文档):

which results in RSpec output (if using --format documentation) of:

User
  must have a first name
  must have a last name

如果您对 RSpec 输出默认值感到满意，您可以进一步缩写它:

You can abbreviate it even further if you are content with the RSpec output defaults:

require 'spec_helper'

describe User do
  it { should have(1).error_on(:first_name) }
  it { should have(1).error_on(:last_name) }
end

导致:

User
  should have 1 error on :first_name
  should have 1 error on :last_name

这篇关于Rails 3.1 Rspec 为模型创建测试用例验证字段的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！