There are two tests you can do for your automation. The test for the trigger and the test for the actions.
The test for the trigger will only tell you if the data source condition is true or false. So the trigger test telling you that the trigger is active means that there is at least one row in every data source after the given filters were applied. If the trigger test tells you that trigger is not active, at least one of the data sources has 0 rows after the filters are applied.
The trigger test does not hold any information if you are using the Schedule trigger.
The test for the actions simply executes all actions defined in this automation regardless of the trigger.
If you appended any data to an email, the data will not be appended if you use the action test to execute your action.