Some special setup is required for testing SWT based applications with QF-Test/swt. Because SWT was not written with testability in mind, applications need to be run with a few slightly modified SWT classes in which we have added the necessary hooks for event filtering and component tracking to enable testing. The changes are transparent so that the behavior of an application is not changed, regardless of whether it is run inside or outside of QF-Test.
If the SUT is run with the QF-Test agent and the option Connect without SWT instrumentation enabled, the required
classes are exchanged by the agent during startup of the SUT. This works for all SWT versions on Windows and
for SWT 4.8 and higher on Linux. Older versions on Linux still need to be instrumented as described below. It
is generally a good idea to include a call to the SWT instrumentation procedure into your startup sequence
with the parameter
forceInstrumentation set to
false. That way QF-Test can determine
dynamically based on options settings and SWT version, whether instrumentation is required or the agent can do
If you use QF-Test's Quickstart Wizard to create the setup sequence for your SUT (see chapter 3), it will take care of SWT instrumentation as well. For those with an aversion to wizard dialogs, the manual way is described next.
The standard library
qfs.qft, which is part of the QF-Test distribution and
described in detail in the tutorial, contains a 'Procedure' with which to perform the
SWT instrumentation. It is named
setup and located in the 'Package'
qfs.swt.instrument. Insert a 'Procedure call' node before the start node
for your SUT in your setup sequence. Set its 'Procedure name' attribute to
qfs.qft#qfs.swt.instrument.setup and in the 'Variable definitions' set
sutdir to the installation directory of your application. The
plugin parameter can be left empty except when you are testing an Eclipse/RCP application
that does not follow the standard plugin directory layout. In that case you can specify
the plugin file to instrument directly via the
plugin parameter. That's all.
In case you want to know what goes on behind the scenes, all manual steps are described
further on in this section.
Supported architectures for SWT testing are 32 and 64 bit Windows and 32 and 64 bit
Linux with Gtk. The instrumentation files are provided in directories called
$VERSION is one of the supported SWT
First you need to determine whether your application is a standalone SWT application or
is based on eclipse. To do so, simply take a look at the directory structure of your
application. If you find a directory called
plugins containing a file
org.eclipse.swt.win32.win32.x86_X.Y.Z.jar (on Windows) or
org.eclipse.swt.gtk.linux.x86_X.Y.Z.jar (on Linux), with
representing a version number like
3.2.0, your application is based on
eclipse. For a standalone SWT application you should find a file called
swt.jar, typically inside a directory called
Simply replace the SWT plugin jar with one instrumented by QF-Test. To create the
instrumented plugin you must run the 'Procedure'
qfs.qft#qfs.swt.instrument.setup described above once with your original
plugin (or a copy thereof) specified in the
plugin parameter. QF-Test will
create a backup copy of the original jar named
_org.eclipse.swt....jar.orig. Next copy the instrumented plugin to the
plugin directory of your application.
Finally, start your application once from the command line with the
-clean command line argument to have it rebuild its plugin cache, e.g.
Your application's binary name may be different from
eclipse, but all
eclipse based applications should support the
For standalone SWT applications, replace the
swt.jar file with the one
provided with QF-Test. You may want to create a backup of the original first.
NoteIf you are launching the client application by means of a
'Start Java SUT client' node, you can set the classpath to point to the corresponding
.../qftest-6.0.0/swt/$ARCH/$VERSION/swt.jar archive and leave
your original file untouched.
|Last update: 5/17/2022|
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