[Lazarus] "Test" button in project inspector

[Werner Pamler]

In the Project inspector window, there is a Test button. What is it good 
for? Its function is not documented in the help file accessible by the 
Help button at the left. What's confusing is that executing "Test" 
reports this error in the Message window for all of my tested projects, 
even for an empty one:

Test: Compiling an empty file: Exit code 1, Errors: 1
Fatal: Syntax error, "BEGIN" expected but "end of file" found