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Dependency lookup was the only option in EJB 21, so if the business method has to access JNDI to obtain a reference to the other session bean, either JNDI must be worked around or the bean class must be refactored so that the lookup code can be replaced with a test-specific version If the code uses the Service Locator2 pattern, we have a bigger problem because a singleton static method is used to obtain the bean reference The only solution for testing beans that use Service Locators outside the container is to refactor the bean classes so that the locator logic can be overridden in a test case Next we have the problem of the dependent bean itself The bean class does not implement the business interface, so it cannot simply be instantiated and made available to the bean we are trying to test.

One of JavaScript s best features is the language s implementation of functions. Whereas other languages present different function types for different purposes, JavaScript only has one function type that covers all use cases from subroutines to lambdas to object methods. A JavaScript function may look simple on the outside but don t be fooled the architecture that hides underneath a basic function declaration is quite complex. And while topics like function forms, scope, context, and function execution may seem too complicated for practical consideration, learning about these details that usually go unnoticed improves your knowledge of the language and provides you with an arsenal to solve even the most complex of problems. There won t be much mention of MooTools in this chapter or the one that follows, so don t be surprised! Instead, we ll be turning our focus on the two essential features of the JavaScript language functions and objects and what we learn in these chapters will not only help us understand the MooTools framework but will also assist us further on in developing complex applications.

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Instead, it will have to be subclassed to implement the business interface, and stubs for a number of low-level EJB methods will have to be provided because the business interface in EJB 21 actually extends an interface that is implemented internally by the application server Even if we get that to work, what happens if we encounter a container-managed entity bean Not only do we have the same issues with respect to the interfaces involved but the bean class is also abstract, with all the persistent state properties unimplemented We could implement them, but our test framework would rapidly start to outgrow the application code We can t even just run them against the database as we can with JDBC code because so much of the entity bean logic, relationship maintenance, and other persistence operations are available only inside an EJB container.

Let s start by agreeing on some terms. From here on, we ll define a function as a separate block of code that performs a certain action and returns a value. It can receive arguments, which are values passed to the function, it can be used to compute the resulting return value, and it can be executed multiple times by invoking it. // a basic function with two arguments: function add(one, two){ return one + two; }; // invoking the function and passing arguments: var result = add(1, 42); console.log(result); // 43 // invoking the function again, but with different arguments: result = add(5, 20); console.log(result); // 25 JavaScript is a language with first-class functions. A first-class function is a function that can be stored in variables, passed as arguments to other functions, and even be used as return values for other functions. This is possible because functions, like almost everything else in JavaScript, are objects. The language also lets you create new functions and transform defined functions at runtime, which, as we ll see later on, enables MooTools to add improvements to native JavaScript.

The dirty secret of many applications written using older versions of Java EE is that there is little to no developer testing at all Developers write, package, and deploy applications; test them manually through the user interface; and then hope that the quality assurance group can write a functional test that verifies each feature It s just too much work to test individual components outside of the application server..

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While there is only one function type in JavaScript, there are multiple function forms, which are the different ways to create a function. The base syntax for most of these forms is called a function literal and it looks like this: function Identifier(FormalParameters, ...){ FunctionBody } First is the function keyword followed by a space and an optional identifier that references your function; next comes an optional comma-separated list of formal parameters wrapped in a pair of parentheses, which are turned into local variables that will be available from inside of your function; and finally, you have the optional function body where you ll write statements and expressions. Take note that those are not typos: a function has a lot of optional parts. We won t elaborate on why these parts are optional right now, but we ll learn more about them throughout the chapter.

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