Time for action – getting values from the UI

If the test tries to access a property from the returned widget, there will be an exception thrown. For example, ctabs.get(0).getText() will result in an Invalid thread access SWT error.

To perform testing on widgets, the code has to run in the UI thread. Either the Display.getDefault().syncExec() or the equivalent Synchronizer class can be used, but SWTBot has a UIThreadRunnable that can launch code and a general interface called StringResult, which is like a Runnable that can return a String value through syncExec.

1. At the end of the testTimeZone method of the UITest class, create a new StringResult and pass it to UIThreadRunnable.syncExec().

2. In the run method, get the first CTabItem and return its text value.

3. After the Runnable method has run, assert that the value is Africa.

4. The code looks like:

   String tabText = UIThreadRunnable.syncExec(new StringResult() {
     @Override
     public String run() {
       return ctabs.get(0).getText();
     }
   });
   assertEquals...