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145 lines
6.4 KiB
Plaintext
145 lines
6.4 KiB
Plaintext
How to write unit tests for wxWidgets
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=====================================
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Unit tests for wxWidgets are written using small cppunit framework. To compile
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(but not to run) them you need to have it installed. Hence the first part of
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this note explains how to do it while the second one explains how to write the
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test.
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I. CppUnit Installation
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-----------------------
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1. Get it from http://www.sourceforge.net/projects/cppunit
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(latest version as of the time of this writing is 1.10.2)
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2. Build the library:
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a) Under Windows using VC++ (versions 6, 7, 8 & 9 work):
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- build everything in CppUnitLibraries.dsw work space
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- add include and lib subdirectories of the directory
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where you installed cppunit to the compiler search path
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using "Tools|Options" menu in VC IDE
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b) Under Unix: run configure && make && make install as usual
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II. Writing tests with CppUnit
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------------------------------
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1. Create a new directory tests/foo
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2. Write a cpp file for the test copying, if you want,
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from one of the existing tests. The things to look for:
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a) #include "wx/cppunit.h" instead of directly including CppUnit headers
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b) don't put too many things in one test case nor in one method of a test
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case as it makes understanding what exactly failed harder later
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c) 'register' your tests as follows so that the test program will find and
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execute them:
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// register in the unnamed registry so that these tests are run by default
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CPPUNIT_TEST_SUITE_REGISTRATION(MBConvTestCase);
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// also include in its own registry so that these tests can be run alone
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CPPUNIT_TEST_SUITE_NAMED_REGISTRATION(MBConvTestCase, "MBConvTestCase");
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Read CppUnit documentation for more.
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d) wxUIActionSimulator can be used when user input is required, for example
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clicking buttons or typing text. A simple example of this can be found
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in controls/buttontest.cpp. After simulating some user input always
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wxYield to allow event processing. When writing a test using
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wxUIActionSimulator always add the test using WXUISIM_TEST rather than
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CPPUNIT_TEST as then it won't run on unsupported platforms. The test itself
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must also be wrapped in a #if wxUSE_UIACTIONSIMULATOR block.
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e) There are a number of classes that are available to help with testing GUI
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elements. Firstly throughout the test run there is a frame of type
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wxTestableFrame that you can access through wxTheApp->GetTopWindow(). This
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class adds two new functions, GetEventCount, which takes an optional
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wxEventType. It then returns the number of events of that type that it has
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received since the last call. Passing nothing returns the total number of
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event received since the last call. Also there is OnEvent, which counts the
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events based on type that are passed to it. To make it easy to count events
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there is also a new class called EventCounter which takes a window and event
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type and connects the window to the top level wxTestableFrame with the specific
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event type. It disconnects again once it is out of scope. It simply reduces
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the amount of typing required to count events.
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3. add a '<sources>' tag for your source file to tests/test.bkl. Make sure it's
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in the correct section: the one starting '<exe id="test_gui"' for a gui test,
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the one starting '<exe id="test" template="wx_sample_console' otherwise.
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III. Running the tests
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----------------------
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1. Regenerate the make/project files from test.bkl using bakefile_gen, e.g.:
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cd build/bakefiles
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bakefile_gen -b ../../tests/test.bkl
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and if you're on a unix system re-run configure.
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2. Build the test program using one of the make/project files in the tests
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subdirectory.
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3. Run the test program by using the command 'test' for the console tests,
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'test_gui' for the gui ones. With no arguments, all the default set of tests
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(all those registered with CPPUNIT_TEST_SUITE_REGISTRATION) are run.
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Or to list the test suites without running them:
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test -l or test_gui -l
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4. Tests that have been registered under a name using
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CPPUNIT_TEST_SUITE_NAMED_REGISTRATION can also be run separately. For
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example:
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test_gui ButtonTestCase
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or to list the tests done by a particular testcase:
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test -L MBConvTestCase
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5. Fault navigation.
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VC++ users can run the programs as a post build step (Projects/Settings/
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Post-build step) to see the test results in an IDE window. This allows
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errors to be jumped to in the same way as for compiler errors, for
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example by pressing F4 or highlighting the error and pressing return.
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Similarly for makefile users: makefiles can be modified to execute the
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test programs as a final step. Then you can navigate to any errors in the
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same way as for compiler errors, if your editor supports that.
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Another alternative is to run the tests manually, redirecting the output
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to a file. Then use your editor to jump to any failures. Using Vim, for
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example, ':cf test.log' would take you to the first error in test.log, and
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':cn' to the next.
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If you would like to set a breakpoint on a failing test using a debugger,
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put the breakpoint on the function 'CppUnit::Asserter::fail()'. This will
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stop on each failing test.
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IV. Notes
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---------
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1. You can register your tests (or a subset of them) just under a name, and not
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in the unnamed registry if you don't want them to be executed by default.
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2. If you are going to register your tests both in the unnamed registry
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and under a name, then use the name that the tests have in the 'test -l'
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listing.
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3. Tests which fail can be temporarily registered under "fixme" while the
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problems they expose are fixed, instead of the unnamed registry. That
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way they can easily be run, but they do not make regression testing with
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the default suite more difficult. E.g.:
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// register in the unnamed registry so that these tests are run by default
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//CPPUNIT_TEST_SUITE_REGISTRATION(wxRegExTestCase);
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CPPUNIT_TEST_SUITE_NAMED_REGISTRATION(wxRegExTestCase, "fixme");
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// also include in its own registry so that these tests can be run alone
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CPPUNIT_TEST_SUITE_NAMED_REGISTRATION(wxRegExTestCase, "wxRegExTestCase");
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4. Tests which take a long time to execute can be registered under "advanced"
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instead of the unnamed registry. The default suite should execute reasonably
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quickly. To run the default and advanced tests together:
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test "" advanced
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=== EOF ===
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Author: VZ & MW
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