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String controller tests together, just like molecular chains. Then verify the results at each step in the chain. You may have noticed from the robustness diagram in Figure 6 1 that controllers tend to form chains. Each controller is an action performed by the system. It ll change the program state in some way, or simply pass a value into the next controller in the chain.

You have already seen assignments on several occasions in this chapter; they consist of an assignment operator and two operands, with the left side being assigned to and the right assigned from. Typically the first operand is a variable and the right one is an expression. The fourth statement of the preceding code snippet is an example of an assignment.

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Note This particular test pattern should be used with caution. There s the school of thought that says that groups of tests that are dependent on each other are fragile and a test antipattern, because if something changes in one of the functions, all the tests from that point onwards in the chain will break a sort of a domino effect. But there are sometimes clear benefits from chained tests, in that each test doesn t need to set up its own set of simulated test fixtures: it can just use the output or program state from the previous test, like the baton in a relay race.

Branching or conditional statements in X++ are as follows: if: Evaluates an expression and executes a single or compound statement depending on the logical result of the expression i.e., it executes it if the expression is true, and doesn t if it s false. It looks like this:

Once the readyState property has a value of 4, you have access to the data sent by the server. You can access this data as a string of text provided by the responseText property. If the data is sent back with a Content-Type header of "text/xml", you can also access the responseXML property, which is

public void method myMethod(int _myInt) { int i, j; if(_myInt == 0) i = _myInt MOD 5; if(_myInt == 0) { i = _myInt MOD 5; i++; } } switch: A multibranch construct that executes the branch whose expression evaluates to true. Each branch is identified by the case keyword, with the default keyword specifying the branch to execute if all others evaluate to false. If you do not provide a default branch and all others evaluate to false, then no branch will execute. As with most languages, once a branch is entered, all code from there onward will be executed unless the switch is exited with a break statement. It looks like this in code: public void method myMethod(int _myInt) { int i, j; switch(_myInt) { case 1, 10, 100: { i = _myInt; j = _myInt / 100; break; } default: { i = _myInt; break; } } } Terniary: Executes one of two statements based on the true or false result of evaluating an expression. We can assign a value of 0 or 1 to a variable depending on the value of another variable being bigger or smaller than 100; see the following code: public void method myMethod(int _myInt) { int i;

Think of it in terms of a bubblegum factory. Gum base, sugar, and corn syrup are passed into the mixing machine, and a giant slab of bubblegum rolls out. The next machine in the chain, the slicer and dicer, expects the slab of bubblegum from the previous machine to be passed in, and we expect little slivers of gum to be the output. The next machine, the wrapping machine, expects slivers of gum, silver foil strips, and paper slips to be passed in and so on. As you ve probably guessed, each machine represents a controller (or discrete function), and a controller test could verify that the output is as expected given the inputs. Figure 6 11 shows some examples of controllers that are linked to form a chain. The first example shows our (slightly contrived) bubblegum factory example; the second is an excerpt from the Advanced Search use case; the third, also from Advanced Search, shows a two-controller chain for the validation example that we re following. In the first two examples, the values being passed along are pretty clear: a tangible value returned from one function is passed along into the next function. At each stage your test could assert that the output value is as expected, given the value returned from the previous function.

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