Bug 41798 New JUnit Plug-in test requires test suites to extend Test
The new JUnit plug-in test seems to require test suites to extend TestSuite. Otherwise an error is reported in the launch config dialog. It is however still possible to launch a test suite by opening it in the editor and choosing Run->Run As->New JUnit Plug-in Test To reproduce, try to run (and configure) the JDT UI AllAllTests testsuite.
org.eclipse.jdt.junit/src/org/eclipse/jdt/internal/junit/launcher/JUnitMainTab.java
config.setAttribute(IJavaLaunchConfigurationConstants.ATTR_MAIN_TYPE_NAME, ""); 
		} else {
			config.setAttribute(IJavaLaunchConfigurationConstants.ATTR_MAIN_TYPE_NAME, fTestText.getText());
			
			config.setAttribute(JUnitBaseLaunchConfiguration.LAUNCH_CONTAINER_ATTR, ""); 			
		}
		config.setAttribute(JUnitBaseLaunchConfiguration.ATTR_KEEPRUNNING, fKeepRunning.getSelection());
	}
	/**
	 * @see ILaunchConfigurationTab#dispose()
	 */
	public void dispose() {
		super.dispose();
		fTestIcon.dispose();
		fJavaElementLabelProvider.dispose();
	}
	/**
	 * @see AbstractLaunchConfigurationTab#getImage()
	 */
	public Image getImage() {
		return fTestIcon;
	}
	/**
	 * Show a dialog that lists all main types
	 */
	protected void handleSearchButtonSelected() {
		Shell shell = getShell();
		
		IJavaProject javaProject = getJavaProject();
		SelectionDialog dialog = new TestSelectionDialog(shell, new ProgressMonitorDialog(shell), javaProject);