Bug 27889 [JUnit] Launcher; all tests in default package ... empty TF
If you select "All tests in Project, Source Folder or Package" and select the default package the TF will be empty. There is no visual indication that one has selected the default package. It should be similar to the indicator in Package Explorer/View: (default package)
org.eclipse.jdt.junit/src/org/eclipse/jdt/internal/junit/launcher/JUnitMainTab.java
private IJavaModel getJavaModel() {
		return JavaCore.create(getWorkspaceRoot());
	}
	/**
	 * @see ILaunchConfigurationTab#isValid(ILaunchConfiguration)
	 */
	public boolean isValid(ILaunchConfiguration config) {		
		setErrorMessage(null);
		setMessage(null);
		
		String projectName = fProjText.getText().trim();
		if (projectName.length() > 0) {
			if (!ResourcesPlugin.getWorkspace().getRoot().getProject(projectName).exists()) {
				setErrorMessage(JUnitMessages.getString("JUnitMainTab.error.projectnotexists")); 
				return false;
			}
		}
		String testName = fTestText.getText().trim();
		if (testName.length() == 0 && fContainerElement == null) {
			setErrorMessage(JUnitMessages.getString("JUnitMainTab.error.testnotdefined")); 
			return false;
		}
		
		return true;
	}
	
	private void testModeChanged() {
		boolean isSingleTestMode= fTestRadioButton.getSelection();
		setEnableSingleTestGroup(isSingleTestMode);
		setEnableContainerTestGroup(!isSingleTestMode);