Rspec筆記

1.   當我們有這樣的需求：一個或者更多的類 擁有同樣的行爲， 那麼可以使用Rspec的 可分享的實例組（a shared example group）. 關鍵詞是
   shared_examples_for 和  it_should_behave_like
   

   shared_examples_for "Any Pizza" do
   it "should taste really good" do
   @pizza.should taste_really_good
   end
   it "should be available by the slice" do
   @pizza.should be_available_by_the_slice
   end
   end
   

   
   

   describe "New York style thin crust pizza" do
   it_should_behave_like "Any Pizza"
   before(:each) do
   @pizza = Pizza.new(:region => 'New York' , :style => 'thin crust' )
   end
   it "should have a really great sauce" do
   @pizza.should have_a_really_great_sauce
   end
   end
   

   
   
   或者使用 share_as
   

   share_as :AnyPizza do
   ...
   end
   describe "New York style thin crust pizza" do
   include AnyPizza
   ...
   end
   

   
   或者直接使用 module ? 應該也可以
   
   
2. 幾種常見的斷言
   

   lambda {
   account.withdraw 75, :dollars
   }.should raise_error(InsufficientFundsError)
   

   
   

   lambda {
   User.create!(:role => "admin" )
   }.should change{ User.admins.count }.from(0).to(1)
   

   
   
   
3. 設置rspec rake 任務
   

   Spec::Rake::SpecTask.new do |t|
   t.spec_opts = ["--color" ]
   end
   

   現在一般的做法是直接設置配置文件
   .rspec
   

   --color

   
   
   
   
4. 一些基本的斷言語句
   http://www.letrails.cn/archives/11-02-advanced-rspec-tutorials-basics/
   

   下面是RSpec測試的一些基礎語法，這些都是會運行通過的測試例:
   
   Strings:
   
   'foo'.should == 'foo'
   'foo'.should === 'foo'
   'foo'.should_not equal('foo')
   ''.should be_empty
   'foo with bar'.should include('with')
   'http://fr.ivolo.us'.should match(/http:\/\/.+/i)
   nil.should be_nil
   
   Numbers:
   
   100.should < 200
   200.should >= 100
   (200 - 100).should == 100
   
   # (100 - 80) is less than 21
   100.should be_close(80,21)
   
   Arrays:
   
   [1,2,3].should have(3).items
   [].should be_empty
   [1,2,3].should include(2)
   
   Hashes:
   
   {}.should be_empty
   {:post => {:title => 'test'}}.should have_key(:post)
   {:post => {:title => 'test'}}.should_not have_key(:title)
   false.should be_false
   true.should be_true
   
   Records:
   
   # assuming @post = Post.new(:title => 'test')
   @post.should be_instance_of(Post)
   @post.should respond_to(:title)

   
   
5. BDD 幾篇特別好的文章分析
   http://www.taobaotesting.com/blogs/qa?bid=11663