Mocked and Stubbed Models in Java

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The built-in helper method mock_model makes a mock object that pretends to be an ActiveRecord object Its companion, stub_model makes a real model instance, but yells at you if and when you try an operation such as saving, which would connect to the database (In other words, it s intended use in unit-test style specs) Ironically, one of the benefits of stub_model is that you don t have to be explicit about its attributes, because they are read from the database You can get a similar effect using mock_model(Foo)as_null_object The mock_model method creates mocks with autogenerated numeric ids and a number of certain common methods stubbed out:
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id Returns an autogenerated primary key value to param Returns the id value as a URL-friendly string new record Returns false errors Returns an empty stub errors collection is a Returns true if the parameter matches model_class
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You should pass in any additional stubbed method values via the stubs hash argument or set them in a block using the yielded mock instance
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1884 Controller Specs
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RSpec gives you the ability to specify your controllers either in isolation from their associated views or together with them, as in regular Rails tests According to the API docs:
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Controller Specs support running specs for Controllers in two modes, which represent the tension between the more granular testing common in TDD and the more high-level testing built into rails BDD sits somewhere in between: we want to achieve a balance between specs that are close
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188 RSpec Rails Gem
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enough to the code to enable quick fault isolation and far enough away from the code to enable refactoring with minimal changes to the existing specs
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The controller class is passed to the describe method like
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describe MessagesController do
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An optional second parameter can provide additional information, or you can explicitly use the controller_name method inside a describe block to tell RSpec which controller to use
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describe "Requesting /messages using GET" do controller_name :messages fixtures :people
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I typically group my controller examples by action and HTTP method This example requires a logged-in user, so I stub my application controller s current_person accessor to return a fixture
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before(:each) do controllerstub!(:current_person, people(:quentin))
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Next, I create a mock Message object using the mock_model method I want this mock message to be returned whenever Messageall is called during the spec
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@message = mock_model(Message) Messagestub!(:all)and_return([@message])
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Now I can start specifying the behavior of actions (in this case, the index action) The most basic expectation is that the response should be successful, HTTP s 200 OK response code
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it "should be successful" do get :index responseshould be_success end
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Additional expectations that should be done for most controller actions include the template to be rendered and variable assignment
it "should render the index template " do get :index responseshould render_template(:index) end it "should assign the found messages for the view" do get :index assigns[:messages]should include(@message) end
18: RSpec
Previously we saw how to stub out a model s association proxy Instead of stubbing the controller s current_person method to return an actual person from the database, we can have it return a mock person
@mock_person = mock_model(Person, :name => "Quentin") controllerstub!(:current_person)and_return @mock_person
Isolation and Integration Modes By default, RSpec on Rails controller specs run in isolation mode, meaning that view templates are not involved The benefit of this mode is that you can spec the controller in complete isolation of the view, hence the name Maybe you can sucker someone else into maintaining the view specs That sucker comment is of course facetious Having separate view specs is not as difficult as it s made out to be sometimes It also provides much better fault isolation, which is a fancy way of saying that you ll have an easier time figuring out what s wrong when something fails If you prefer to exercise your views in conjunction with your controller logic inside the same controller specs, just as traditional Rails functional tests do, then you can tell RSpec on Rails to run in integration mode using the render_views macro It s not an all-or-nothing decision You can specify modes on a per-behavior basis