MACROMEDIA FLEX 2-TESTING FLEX APPLICATIONS WITH MERCURY QUICKTEST PROFESSIONAL Manuale Utente Scaricare il pdf (Pagina 14)

493 CHAPTER 23 Debugging and testing

myVar = myText.text;

}

</mx:Script>

<mx:TextInput id="myText"/>

<mx:Button click="setMyVar()" label="Set Variable"/>

</mx:Application>

2 Watch the

myVar

and

myText.text

variables.

3 Launch your application in Debug mode.

4 Type something in the text box, and click the button. The application will sus-

pend execution.

5 Switch to Flex Builder; you should see the variables listed.

6 Keep clicking the Step Into button,

and watch how the variables change

(see figure 23.4).

This process of using a Debugger will be a

new experience for those coming from

high-level languages like ColdFusion and

PHP, because the asynchronous nature of

Flex lends itself to the step debugging

needed in an event-driven environment.

Once you do it a few times, you’ll get used to it.

Similar to debugging is the process of testing. Whereas debugging is about fixing

problems, testing is about making sure problems don’t exist.

23.2 Testing

It’s always a good idea as part of your Systems Development Life Cycle to do as much up-

front testing as possible before you go live with the application.

ASP, PHP, ColdFusion,

and other such languages will tell you the line of code and filename when a crash

occurs—this luxury doesn’t exist in the land of Flex because of its compiled nature.

After you’ve finished the debugging phase, testing is a good idea to make sure new

features work the way they’re supposed to and previous features continue to function.

Testing is also an opportunity to fine-tune the application.

23.2.1 Types of tests

Three main types of testing are available:

■

Profiling

■

Unit testing

■

Functional testing

Let’s define each, starting with profiling.

PROFILING

Profiling is a process whereby you’re not testing for proper behavior but rather are

looking to see how you can optimize the resource usage of your application. Using

Set breakpoint

here

Figure 23.4 Watched variables show their

values in the Expressions view.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 26 27

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