Once the expression and variable(s) is configured properly, click Test to verify the expression. A dialog box is displayed to show you the results of your test. The following is an example:
If you made changes, upon closing the Test Expression dialog box, a message asking Do you want to update the action? is displayed. Click Yes, if you want the action's Expression field to reflect the Test Expression dialog box's configuration. Click Don't update to return to the action without changing the existing configured expression.