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Qt Test is a framework for unit testing Qt based applications and libraries. Qt Test provides all the functionality commonly found in unit testing frameworks as well as extensions for testing graphical user interfaces.

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Qt Test is designed to ease the writing of unit tests for Qt based applications and libraries:

Then we add some data to the table using the QTest::newRow function. Each set of data will become a separate row in the test table. QTest::newRow takes one argument: a name that will be associated with the data set and used in the test log to identify the data set. Then we stream the data set into the new table row. The QTest framework makes executing tests easy in that the code in the QTESTAPPLESSMAIN MACO, which takes a reference to the Test Class, will inspect the Test Class for any Private Slots and assume them to be Test Methods that it must execute. Note that we are Qtest Private Slotsan informational resource only, featuring reviews and recommendations of casinos, games, and bonuses. We are not a casino and no gambling with real money takes place on this site. Laws pertaining to online gambling vary between countries and states.

Creating a Test

To create a test, subclass QObject and add one or more private slots to it. Each private slot is a test function in your test. QTest::qExec() can be used to execute all test functions in the test object.

In addition, there are four private slots that are not treated as test functions. They will be executed by the testing framework and can be used to initialize and clean up either the entire test or the current test function.

• initTestCase() will be called before the first test function is executed.
• cleanupTestCase() will be called after the last test function was executed.
• init() will be called before each test function is executed.
• cleanup() will be called after every test function.

If initTestCase() fails, no test function will be executed. If init() fails, the following test function will not be executed, the test will proceed to the next test function.

Example:

For more examples, refer to the Qt Test Tutorial.

Building a Test

If you are using qmake as your build tool, just add the following to your project file:

If you would like to run the test via make check, add the additional line:

To prevent the test from being installed to your target, add the additional line: Casino owatonna mn map.

See the qmake manual for more information about make check.

If you are using other build tools, make sure that you add the location of the Qt Test header files to your include path (usually include/QtTest under your Qt installation directory). If you are using a release build of Qt, link your test to the QtTest library. For debug builds, use QtTest_debug.

See Writing a Unit Test for a step by step explanation.

Qt Test Command Line Arguments

Syntax

The syntax to execute an autotest takes the following simple form:

Substitute testname with the name of your executable. testfunctions can contain names of test functions to be executed. If no testfunctions are passed, all tests are run. If you append the name of an entry in testdata, the test function will be run only with that test data.

For example:

Runs the test function called toUpper with all available test data.

Runs the toUpper test function with all available test data, and the toInt test function with the test data called zero (if the specified test data doesn't exist, the associated test will fail).

Runs the testMyWidget function test, outputs every signal emission and waits 500 milliseconds after each simulated mouse/keyboard event.

Options

Logging Options

The following command line options determine how test results are reported:

• -ofilename,format
  Writes output to the specified file, in the specified format (one of txt, xml, lightxml, xunitxml or tap). The special filename - may be used to log to standard output.
• -ofilename
  Writes output to the specified file.
• -txt
  Outputs results in plain text.
• -xml
  Outputs results as an XML document.
• -lightxml
  Outputs results as a stream of XML tags.
• -xunitxml
  Outputs results as an Xunit XML document.
• -csv
  Outputs results as comma-separated values (CSV). This mode is only suitable for benchmarks, since it suppresses normal pass/fail messages.
• -teamcity
  Outputs results in TeamCity format.
• -tap
  Outputs results in Test Anything Protocol (TAP) format.

The first version of the -o option may be repeated in order to log test results in multiple formats, but no more than one instance of this option can log test results to standard output.

If the first version of the -o option is used, neither the second version of the -o option nor the -txt, -xml, -lightxml, -teamcity, -xunitxml or -tap options should be used.

If neither version of the -o option is used, test results will be logged to standard output. If no format option is used, test results will be logged in plain text.

Test Log Detail Options

The following command line options control how much detail is reported in test logs:

• -silent
  Silent output; only shows fatal errors, test failures and minimal status messages.
• -v1
  Verbose output; shows when each test function is entered. (This option only affects plain text output.)
• -v2
  Extended verbose output; shows each QCOMPARE() and QVERIFY(). (This option affects all output formats and implies -v1 for plain text output.)
• -vs
  Shows all signals that get emitted and the slot invocations resulting from those signals. (This option affects all output formats.)

Testing Options

The following command-line options influence how tests are run:

• -functions
  Outputs all test functions available in the test, then quits.
• -datatags
  Outputs all data tags available in the test. A global data tag is preceded by ' __global__ '.
• -eventdelayms
  If no delay is specified for keyboard or mouse simulation (QTest::keyClick(), QTest::mouseClick() etc.), the value from this parameter (in milliseconds) is substituted.
• -keydelayms
  Like -eventdelay, but only influences keyboard simulation and not mouse simulation.
• -mousedelayms
  Like -eventdelay, but only influences mouse simulation and not keyboard simulation.
• -maxwarningsnumber
  Sets the maximum number of warnings to output. 0 for unlimited, defaults to 2000.
• -nocrashhandler
  Disables the crash handler on Unix platforms. On Windows, it re-enables the Windows Error Reporting dialog, which is turned off by default. This is useful for debugging crashes.
• -platformname
  This command line argument applies to all Qt applications, but might be especially useful in the context of auto-testing. By using the 'offscreen' platform plugin (-platform offscreen) it's possible to have tests that use QWidget or QWindow run without showing anything on the screen. Currently the offscreen platform plugin is only fully supported on X11.

Benchmarking Options

The following command line options control benchmark testing:

• -callgrind
  Uses Callgrind to time benchmarks (Linux only).
• -tickcounter
  Uses CPU tick counters to time benchmarks.
• -eventcounter
  Counts events received during benchmarks.
• -minimumvaluen
  Sets the minimum acceptable measurement value.
• -minimumtotaln
  Sets the minimum acceptable total for repeated executions of a test function.
• -iterationsn
  Sets the number of accumulation iterations.
• -mediann
  Sets the number of median iterations.
• -vb
  Outputs verbose benchmarking information.

Miscellaneous Options

• -help
  Outputs the possible command line arguments and gives some useful help.

Creating a Benchmark

To create a benchmark, follow the instructions for creating a test and then add a QBENCHMARK macro to the test function that you want to benchmark. Fortune bay resort casino tower.

The code inside the QBENCHMARK macro will be measured, and possibly also repeated several times in order to get an accurate measurement. This depends on the selected measurement back-end. Several back-ends are available. They can be selected on the command line:

In short, walltime is always available but requires many repetitions to get a useful result. Tick counters are usually available and can provide results with fewer repetitions, but can be susceptible to CPU frequency scaling issues. Valgrind provides exact results, but does not take I/O waits into account, and is only available on a limited number of platforms. Event counting is available on all platforms and it provides the number of events that were received by the event loop before they are sent to their corresponding targets (this might include non-Qt events).

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The Linux Performance Monitoring solution is available only on Linux and provides many different counters, which can be selected by passing an additional option -perfcounter countername, such as -perfcounter cache-misses, -perfcounter branch-misses, or -perfcounter l1d-load-misses. The default counter is cpu-cycles. The full list of counters can be obtained by running any benchmark executable with the option -perfcounterlist.

• Notes:
  • Using the performance counter may require enabling access to non-privileged applications.
  • Devices that do not support high-resolution timers default to one-millisecond granularity.

See Writing a Benchmark in the Qt Test Tutorial for more benchmarking examples.

© 2020 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.

How to write a unit test.

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In this first chapter we will see how to write a simple unit test for a class, and how to execute it.

Writing a Test

Let's assume you want to test the behavior of our QString class. First, you need a class that contains your test functions. This class has to inherit from QObject:

Note: You need to include the QTest header and declare the test functions as private slots so the test framework finds and executes it.

Then you need to implement the test function itself. The implementation could look like this:

The QVERIFY() macro evaluates the expression passed as its argument. If the expression evaluates to true, the execution of the test function continues. Otherwise, a message describing the failure is appended to the test log, and the test function stops executing.

But if you want a more verbose output to the test log, you should use the QCOMPARE() macro instead:

If the strings are not equal, the contents of both strings are appended to the test log, making it immediately visible why the comparison failed.

Finally, to make our test case a stand-alone executable, the following two lines are needed:

The QTEST_MAIN() macro expands to a simple main() method that runs all the test functions. Note that if both the declaration and the implementation of our test class are in a .cpp file, we also need to include the generated moc file to make Qt's introspection work.

Executing a Test

Now that we finished writing our test, we want to execute it. Assuming that our test was saved as testqstring.cpp in an empty directory, we build the test using qmake to create a project and generate a makefile.

Note: If you're using windows, replace make with nmake or whatever build tool you use.

Running the resulting executable should give you the following output:

Congratulations! You just wrote and executed your first unit test using the Qt Test framework.

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© 2020 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.