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CHAPTER 16 UNIT TESTING
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Having looked at the test cases, you might want to see the results from testing a class that was designed for a specific application. The lessons learned are that things are not perfect and that you must handle the imperfections in the test cases. When you run into debug and warning messages, you can suppress them by using a call to the QTest::ignoreMessage(QString) method. It is good to know that this method can t be used to stop a qFatal message from stopping the unit test application. If a test fails, you can prevent the unit test from stopping by using the QEXPECT_FAIL macro. The macro is reported as an XFAIL item in the results log, but the test case is still considered to be passed. See Listing 16-26 for an example. The most disturbing adaptation that had to be made in the ImageCollectionTest class was the workaround for avoiding the QtSql module warning about the default connection being replaced. This message could have been removed by using the QTest::ignoreMessage method. Instead the issue was fixed from the unit test by removing the default connection at the end of each test case. Either method is an indication that the ImageCollection class is limited to being created only once for each time the application using it is being run. Listing 16-26. The results from testing the ImageCollection class ********* Start testing of ImageCollectionTest ********* Config: Using QTest library 4.2.2, Qt 4.2.2 PASS : ImageCollectionTest::initTestCase() XFAIL : ImageCollectionTest::testTags() The tag will be added to the non-existing image. imagecollectiontest.cpp(43) : failure location PASS : ImageCollectionTest::testTags() PASS : ImageCollectionTest::testImages() PASS : ImageCollectionTest::testImagesFromTags() PASS : ImageCollectionTest::cleanupTestCase() Totals: 5 passed, 0 failed, 0 skipped ********* Finished testing of ImageCollectionTest ********* Each of the symptoms and methods described here is an indication that something needs to be adjusted in the class being tested. When testing, sometimes the unexpected warnings might have to be suppressed, but that should not be necessary with ordinary usage. When looking at what to test, it is important to try to go beyond the expected. By testing how the code reacts to invalid input data, you can create more robust code. By not letting your code enter undefined states, you make the rest of the application easier to debug. Otherwise, the discovery of an error can be delayed because the error is not made visible until later interaction between the flawed component and the rest of the application.
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Unit testing is a method to ensure that your software components fulfill the specifications, which makes it possible to focus the testing resources in the project on more useful areas. It is important to focus on testing the interface, not the internals of the class begin tested. The tests should not only test the valid and expected data; they should also provoke by
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CHAPTER 16 UNIT TESTING
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passing unexpected data. This provocation helps to make your software components more robust. Qt s unit testing framework, the QtTest module, can be included in the project by adding a line reading CONFIG += qtestlib to the project file. The module consists of a set of macros for testing: QCOMPARE( actual value, expected value ): Compares the actual value to the expected value. QVERIFY( expression ): Evaluates the expression and considers the test to have passed if the result is true. QTEST( actual value, column name ): Compares the actual value to the column value from the current data row. When using the QTEST macro, you need to provide your test with a test vector of data by using a data slot, which has the same name as the test slot, but ends with _data. The data slot creates a set of columns by using the static QTest::addColumn<type>(char*) method, and rows of data are then added with the static QTest::newRow(char*) method to which the data is fed by using the << operator. The data can be retrieved from the test slot with the QFETCH(type, column name) macro or the QTEST macro. When testing Qt components, it is important to be able to intercept signals. They are intercepted and recorded by using the QSignalSpy class. When building an executable from a unit test, the main function is created using the QTEST_MAIN( test class ) macro. The main function takes care of creating an instance of the unit test class and performing the tests.
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