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For instance, you might test a function so that it always performs the right calculation or you might test an interface to ensure that the internal state of an object behaves as expected In both these situations, it is important to test both common cases and borderline cases Tests validating the common cases can be few, but they should ensure that most of the used unit functionality works properly The test must also include handling bad user input For example, when a user enters an invalid input, a null string can be returned or a warning message might be emitted.

Begin by opening another command window and get ready to try out the next three listings as we review them First, we will try out the introspection capability that we turned on in this particular server Note that this ability is optional, and it may not be available on many other XML-RPC services that you use online or that you deploy yourself Listing 18 2 shows how introspection happens from the client s point of view Listing 18 2 Asking an XML-RPC Server What Functions It Supports #!/usr/bin/env python # Foundations of Python Network Programming - 18 - xmlrpc_introspectpy # XML-RPC client import xmlrpclib proxy = xmlrpclibServerProxy('http://127001:7001') print 'Here are the functions supported by this server:' for method_name in proxysystemlistMethods(): if method_namestartswith('system'): continue signatures = proxysystem.

1. setMapView takes five fields in the following order; enter the data as shown:

The borderline cases ensure that the function actually performs, even close to the borders facing the users (for instance, to ensure that both ends of a list are accessible or that the user can enter an arbitrarily large value in an input field, but also that a mathematical function can handle all the extreme points of its function, even the biggest possible number that can be passed to it)..

methodSignature(method_name) if isinstance(signatures, list) and signatures: for signature in signatures: print '%s(%s)' % (method_name, signature) else: print '%s(..)' % (method_name,) method_help = proxysystemmethodHelp(method_name) if method_help: print ' ', method_help.

Figure 16-1. The order of execution when a unit test is run Listing 16-1 presents the basic structure of the class implementing the tests and the QTEST_MAIN macro that runs the actual tests using a special unit test main function. The main function macro can be placed anywhere even in a different file from the test class. Listing 16-1. Basic structure of a unit test class MyTestClass : public QObject { Q_OBJECT private slots: // Test cases goes here }; ... QTEST_MAIN( DateTest )

The introspection mechanism is an optional extension that is not actually defined in the XML-RPC specification itself. The client is able to call a series of special methods that all begin with the string system. to distinguish them from normal methods. These special methods give information about the other calls available. We start by calling listMethods(). If introspection is supported at all, then we will receive back a list of other method names; for this example listing, we ignore the system methods and only proceed to print out information about the other ones. For each method, we attempt to retrieve its

The project file for the test case needs to include the class being tested, the test class, and a configuration line reading CONFIG += qtestlib. It is possible to create such a file by running qmake -project CONFIG+=qtestlib. Let s have a look at it in detail. To Qt, tests are really just applications, so the project file starts with the app template (you also use the standard include and dependency paths): TEMPLATE = app INCLUDEPATH = . DEPENDPATH = . Then you give the target application a name: TARGET = mytestapp Next follows the class being tested both the headers and sources: HEADERS += myclass.h SOURCES += myclass.cpp Then follows the test class headers and sources as well as a main.cpp file that contains the main function: HEADERS += mytestclass.h SOURCES += mytestclass.cpp main.cpp Finally, the configuration line: CONFIG += qtestlib

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