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The code in Listing 717 relies on the Userfind method in the controller action to retrieve the right user from the test database A second way to achieve this same result is using a technique called stubbing, using RSpec s stub! method:

.

NullOutputStream() write(byte[] barr, int offset, int length) write(int b)

This code ensures that any call to Userfind with the given id will return @user Since this is just what we have in the application code (Listing 714), the stub will cause RSpec to intercept the call to Userfind and, instead of hitting the database, return @user instead Many Rails programmers, especially RSpec users, prefer this stubbing approach because it separates the controller tests from the model layer Indeed, the Rails 23 version of this book uses stubs, along with the closely related technique of message expectations After gaining more experience with stubs and expectations, and especially after fielding lots of questions from readers of the Rails 23 Tutorial confused by these issues, I have concluded that stubbing and related techniques are not worth the trouble Figuring out exactly when to stub things out is difficult, and message expectations are incredibly subtle and error-prone (see, eg, Box 81 in the Rails 23 Tutorial book) To the common objection, But now the controller tests hit the test database! , I now find myself saying: So what In my experience it has never mattered I see no compelling reason not to hit the model layer in the controller tests, especially when it leads to much simpler tests If you are interested in learning stubbing and message expectation techniques, I recommend reading the Ruby on Rails 23 Tutorial book Otherwise, I suggest not worrying about enforcing a full separation of the model and controller layers in Rails tests Although the controller tests in the rest of this book will hit the test database, at a conceptual level it will always be clear which part of MVC is being tested By the way, in principle the tests should run faster when the controllers don t hit the database, and for the full Rails Tutorial sample application test suite they do---by around two-tenths of a second.

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Summary

javautilEnumeration enumerateAllAdapters()

There are two other details in Listing 717 worth noting First, in the call to get, the test uses the symbol :show instead of the string show , which is different from the convention in the other tests (for example, in Listing 310 we wrote get home ) Both

get 'show'

getAdapter(String adapterName, String portName) throws adapterOneWireIOException, OneWireException getDefaultAdapter() throws adapterOneWireIOException, OneWireException getProperty(String propName)

do the same thing, but when testing the canonical REST actions (Table 62) I prefer to use symbols, which for some reason feel more natural in this context15 Second, note that the value of the hash key :id, instead of being the user s id attribute @userid, is the user object itself:

XML design is a creative process and requires intuitive thinking In this chapter, I've shown you an approach to XML design that I've used with some success The value of XML is that you don't need to be a professional information designer to start using it in projects And once you start using it, you

comdalsemionewireadapterDSPo rtAdapter byte[] long String String String int javautilEnumeration String boolean

to accomplish the same thing, but in this context Rails automatically converts the user object to the corresponding id16 Using the more succinct construction

is a very common Rails idiom Because of the code we added in Listing 625, the test in this section already passes If you re feeling paranoid, you can comment out the line

doSpeed() throws comdalsemionewireadapterOneWi reIOException, comdalsemionewireOneWireException getAdapter()

@user = Userfind(params[:id])

getAddress() getAddressAsLong() getAddressAsString() getAlternateNames() getDescription() getMaxSpeed() getMemoryBanks() getName() isAlarming() throws comdalsemionewireadapterOneWi reIOException, comdalsemionewireOneWireException isPresent() throws comdalsemionewireadapterOneWi reIOException, comdalsemionewireOneWireException OneWireContainer() OneWireContainer(comdalsemionewireadapter DSPortAdapter sourceAdapter, byte[] newAddress) OneWireContainer(comdalsemionewireadapter DSPortAdapter sourceAdapter, long newAddress) OneWireContainer(comdalsemionewireadapter DSPortAdapter sourceAdapter, String newAddress) setSpeed(int newSpeed, boolean fallBack)

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