The tests could be debugged in such way:
- insert a break point from the location from where you want to execute test step by step
 
- run the test case
 
- test case execution will be paused at the given break point
 
- click on the blue button to continue with the next statement
 
- to continue executing all the commands at a time click on the “Run” button
 
This way tou can keep a track of your test and also debug it.