The Rule Editor contains a Preview section which displays the results of your rule using sample data.

Note: A flag next to the Rule Preview label will automatically display the validity of the current rule. 

Occasionally you will find that the auto-generated sample data does not sufficiently test your rule.  In this case, you may 

change the values by pressing the Edit button.  Each cell will then have two icons to refresh or completely remove the value in that cell.  Good to know: The Remove icon will be grayed out in cells where blank fields are not permitted.

Once you are satisfied with the sample data, press the Run button to preview the rule.