Running Autotests

Qt Creator integrates the Qt Test framework and Google C++ Testing Framework for unit testing applications and libraries. You can use Qt Creator to build and run Qt tests, Qt Quick tests (QML-based Qt tests), and Google tests for your projects.

Creating Tests

You can use a wizard to create projects that contain Qt or Google tests.

Creating Qt Tests

To create a Qt test:

  1. Select File > New File or Project > Other Project > Auto Test Project > Choose to create a project with boilerplate code for a Qt test.
  2. In the Project and Test Information dialog, specify settings for the project and test:
    1. In the Test framework field, select Qt Test.
    2. Select the GUI Application check box to create a Qt application.
    3. In the Test case name field, enter a name for the test case.
    4. Select the Requires QApplication check box to add the include statement for QApplication to the main.cpp file of the project.
    5. Select the Generate initialization and cleanup code checkbox to add functions to your test that are executed by the testing framework to initialize and clean up the test.
    6. In the Build system field, select the build system to use for building the project: qmake, CMake, or Qbs.

Qt Creator creates the test in the specified project directory. Edit the .cpp file to add private slots for each test function in your test. For more information about creating Qt tests, see Creating a Test.

Creating Google Tests

To create a Google test:

  1. Select File > New File or Project > Other Project > Auto Test Project > Choose to create a project with boilerplate code for a Google test.
  2. In the Project and Test Information dialog, specify settings for the project and test:
    1. In the Test framework field, select Google Test.
    2. In the Test case name field, enter a name for the test case.
    3. In the Test set name field, enter a name for the test set.
    4. Select the Enable C++ 11 check box to support C++ 11 features in the test.
    5. In the Google test repository field, select a directory that contains a clone of the googletest repository.

      To use an installed Google C++ Testing framework instead, see Setting Up the Google C++ Testing Framework.

    6. In the Build system field, select the build system to use for building the project: qmake, CMake, or Qbs.

Qt Creator creates the test in the specified project directory. For more information about creating Google tests, see the Google Test Primer.

Setting Up the Google C++ Testing Framework

To build and run Google tests, you must have the Google C++ Testing framework installed and configured on the development host. You can either clone it from Git Hub or install it from an installation package.

To configure a project to use a cloned Google testing framework, edit the INCLUDEPATH variable in the project file (.pro) to include the source and include folders of Google Test's googletest and googlemock. Usually, you need to add the following subfolders:

  • googletest
  • googlemock
  • googletest/include
  • googlemock/include

You also need to add the necessary files to the SOURCES variable. For example:

  • googletest/src/gtest-all.cc
  • googlemock/src/gmock-all.cc

To configure a project to use an installed Google testing framework package, add the following include paths to the .pro file:

  • <googletest_install_path>/include/gtest
  • <googletest_install_path>/include/gmock

Then add linker options to be able to find the libraries and to link against them. For example, for qmake based projects, you typically need to add the following values to the .pro file:

  • LIBS += -lgtest -L<path_to_gtest_lib>
  • LIBS += -lgmock -L<path_to_gmock_lib>

Building and Running Tests

To build and run tests:

  1. Open a project that contains tests.
  2. In the Tests view, select the tests to run.
  3. In the Test Results output pane, select (Run All Tests) to run all test or (Run Selected Tests) to run the selected tests.

    Note: By default, Qt Creator builds a project before deploying and running it.

If a test takes more than a minute to execute, the default timeout might stop the test execution. To increase the timeout, select Tools > Options > Test Settings > General.

Selecting Tests to Run

The Tests view shows all the tests found for the currently active test frameworks in the current project. Select the test cases to run.

If a Qt Quick test case does not have a name, it is marked Unnamed in the list. Unnamed test cases are executed when you select Run All Tests. You cannot select or deselect them.

Qt Creator scans the project for tests when you open the project and updates the test list for the currently active test frameworks when you edit tests. To refresh the view, select Rescan Tests in the context menu.

You can add filters to specify the directories within the current project to scan for tests. Select Tools > Options > Test Settings > General > Add, and specify paths to the directories to scan for tests. Wildcards are not supported in the filter expressions.

To show or hide init and cleanup or data functions in the Tests view, select (Filter Test Tree), and then select Show Init and Cleanup Functions or Show Data Functions. Double-click a function in the list to open its source code in the code editor.

The test cases are listed in alphabetic order. To list them in the order in which they are defined in the source code, select (Sort Naturally).

Specifying Settings for Running Qt Tests

The code inside a benchmark test is measured, and possibly also repeated several times in order to get an accurate measurement. This depends on the measurement back-end that you can select in the Benchmark Metrics group in Tools > Options > Test Settings > Qt Test: walltime, CPU tick counter, event counter, Valgrind Callgrind, and Linux Perf. For more information, see Creating a Benchmark.

To receive verbose output when running benchmarks, select the Verbose benchmarks check box.

To allow the debugger to interrupt Qt tests on assertions, select the Disable crash handler while debugging check box.

To record information about signals and slots in the test log, select the Log signals and slots check box.

Specifying Settings for Running Google Tests

To specify settings for running Google tests, select Tools > Options > Test Settings > Google Test.

To run disabled tests, select the Run disabled tests check box.

To run several iterations of the tests, select the Repeat tests check box and enter the number of times the tests should be run in the Iterations field. To make sure that the tests are independent and repeatable, you can run them in a different order each time by selecting the Shuffle tests check box.

To turn failures into debugger breakpoints, select the Break on failure while debugging check box. To turn assertion failures into C++ exceptions, select the Throw on failure check box.

Viewing Test Output

The test results are displayed in the Test Results output pane in XML format. XML can be parsed more easily and reliably than plain text.

However, if a Qt test crashes, it might not produce complete XML code that can be parsed, which might lead to information loss. The lost information might be retrievable when viewing the results as plain text. To view the results of Qt tests as plain text, select Tools > Options > Test Settings > Qt Test, and then deselect the Use XML output check box. Then select the (Switch Between Visual and Text Display) button in the Test Results output pane to switch to the text display.

The following table lists the messages that the Test Results output pane displays:

ResultDescription
BENCHBenchmark test.
BFAILBlacklisted test case failed. Since Qt 5.4, you can provide a BLACKLIST file for tests. It is mainly used internally by the Qt CI system.
BPASSBlacklisted test case passed.
DEBUGDebug message.
XFAILTest case is expected to fail, so it is marked by using the QEXPECT_FAIL macro. If the test case passes instead, an unexpected pass (XPASS) is written to the test log.
FAILTest case failed. Double-click the line for more information.
FATALA fatal error occurred that stops the test case from being run, for example.
INFOInformative message.
INTERNALInternal message.
PASSTest case passed.
SKIPTest case was skipped.
SYSTEMAn error message received from or influenced by the OS.
XPASSTest case passed even though it was expected to fail.
WARNWarning message.

To view only messages of a particular type, select (Filter Test Results), and then select the types of messages to show.

By default, test result output is limited to 100,000 characters. The output pane is automatically scrolled down when new results are added. To display full results, select Tools > Options > Test Settings > General, and then deselect the Limit result output check box. To disable automatic scrolling, deselect the Automatically scroll results check box.

Internal messages and run configuration warnings for guessed configurations are omitted by default. To view them, deselect the Omit internal messages and Omit run configuration warnings check boxes.

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