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The Eclipse Platform is tested during every build by an extensive suite of automated tests. These tests are written using the JUnit test framework. This page contains links to information about how to run and create automated tests for the platform.

Correctness tests

The majority of automated tests are testing for program correctness. A test failure on these tests implies that program behaviour is not as expected by the tests. These tests are run every build on Windows, Linux, and Mac OSX.

  • See this page for information about running JUnit4 tests within the Automated Testing Framework.

Running tests from within Eclipse

Correctness tests can be run manually from within the Eclipse IDE using a "JUnit Plug-in Test" launch configuration:

  1. Check out the test plugin containing the tests you want to run, along with any prerequisite plug-ins. Here are some plug-ins you will likely need:
    • org.junit - The JUnit test framework
    • org.eclipse.test - The basic infrastructure for running Eclipse tests
    • org.eclipse.core.tests.harness - Various utility pieces used by many tests
    • org.eclipse.core.tests.runtime - Tests for the runtime component
    • org.eclipse.core.tests.resources - Tests for the resources component
    • org.eclipse.ui.tests.harness - Various utility pieces used by UI tests
    • org.eclipse.ui.tests - Tests for the Eclipse UI
  2. In the Navigator or Package Explorer, select the test or test suite you want to run. Each test package typically contains a TestSuite class that contains all the tests in that package. Suites from multiple packages are then aggregated into higher level suites. Here are some useful suites to know about:
    • org.eclipse.ui.tests.UiTestSuite - runs all UI tests
    • org.eclipse.core.tests.runtime.AutomatedTests - runs all runtime tests
    • org.eclipse.core.tests.resources.AutomatedTests - runs all resource tests
  3. Select Run > Run...
  4. Choose the "JUnit Plug-in Test" category, and click the button to create a new test
  5. On the "Main" tab, select the appropriate application for that test. Here are some important applications to know about:
    • [No Application] - Headless Mode - for running headless core (runtime, osgi, resource) tests
    • org.eclipse.ui.ide.workbench - for running UI tests
  6. Click Run.

Using EasyMock

In the Eclipse Galileo release the utility EasyMock was added to the platform test framework. EasyMock is used to create fake implementations of objects in order to test units of functionality in isolation from other objects. See the EasyMock documentation for more details.

To use EasyMock in your tests, simply load the org.easymock bundle from the Orbit repository. There is a convenience easymock.psf project set file in the org.eclipse.test bundle to facilitate loading of this bundle.

Note that EasyMock requires Java 5 or greater. At this time, we run tests on Java 1.4.2 and Java 5. This means you need to add the following to the Ant target for your tests (contact releng for details):

<target name="YourTestTarget" depends="setJVMProperties">
<property name="jvm" value="${J2SE-5.0}" />
<condition property="skip.test">
  <isset property="J2SE-5.0" />
... remaining target definition as usual

Session tests

Session Tests in Eclipse are tests that require that a new Eclipse session be launched for every test case run. Thus, they have additional requirements regarding controling the environment test cases are run (VM, set of plug-ins available, configuration, instance location, command line parameters) and how results are communicated back to the test runner.

Performance tests

See the Performance Tests How-to

Profiling performance tests

It can be very useful to capture profiling data for performance tests, to help track down where the time is going. To ensure you are profiling exactly the same code paths that are running in the automated performance tests, you can attach a headless profiler to the performance tests within the test suite. Here are steps to attach a headless YourKit agent to a performance test. The resulting snapshots can later be opened for analysis from the YourKit client:

  1. Download the tests for the build you are interested in (available from same download page as the build itself).
  2. Unzip the test framework, and follow the instructions in the readme.html to configure your tests
  3. Create a properties file (let's say profile.properties) with the following contents:
  1. Invoke the performance test and specify the properties file location:
 runtests "-Dtest.target=performance" -properties profile.properties <yourtarget>

If your performance test is a session test, a more complex spell is needed in your profile.properties file:


This instructs the Session Tests framework to specify the provided vm arguments on each nested invocation that runs the session test. Note the session test framework override mechanism requires escaping '=' characters with '==', separating multiple arguments with a ';' character rather than a space, and omitting the leading '-' character.

The above options will instruct the profile agent to start CPU sampling immediately on startup, and to save a performance snapshot on exit. YourKit supports various other options for configuring the headless profile agent.

UI tests

UI testing tools
Tool Pros Cons
Window Tester
  • looks stable
  • recorder available
  • creates JUnit tests, can be launched along with other tests
  • easy API, good documentation
  • very easy to modify generated code
  • API looks similar to SWTBot API, tests could be perhaps migrated to SWTBot when it's stable
  • large footprint when creating tests (around 60MB for Window Tester plug-ins)
  • sensitive for focus changing, very hard to debug these UI tests (i.e. changing focus to the host Eclipse causes exceptions)
  • not free, however Eclipse committers are allowed to use it
  • we would need a license to use libraries on our test servers
GUI Dancer
  • platform independent
  • Extensible using Java
  • commercial, quite expensive 4641 euro for a license for one GUI toolkin (SWT/RCP)
  • "not a capture/replay tool"
  • tests cannot be run as JUnits
  • store tests in a database
  • this tool doesn't make writing tests easier ;) I've found it pretty hard to start working with (especially comparing to tools like swtbot)
  • eclipse project in incubator
  • open source, free license, EPL
  • no recording/playback feature available
  • poor documentation, one example on wiki, only javadocs
  • some major loss of function, e.g. 259908, some have workarounds
  • long responses on important bugs e.g. 259908 and 271132
  • cannot test native dialogs (File Dialogs, Color Dialogs, etc) see 164192
  • tests are run as SWTBot tests, not PDE-JUnit tests (run in non-UI thread)
Automated GUI Recorder
  • recorder
  • ability to provide your own Widget Resolver
  • open source, free license, EPL
  • seems pretty stable, used by TPTP to do UI tests
  • large footprint when creating tests (probably around 50MB - TPTP Platform and TPTP Test Tools)
  • test description in XML only but verification points in Java code only
  • didn't find any way to test absence of a dialog
  • can't run tests in debug mode
  • provided as is (because IBM pulled resources out of TPTP)
  • looks nice and powerful
  • got nice features
  • is implemented using COM technology
  • works only on Windows

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