| 0. Run dart --observe log.dart | |
| 1. Visit main isolate's logging page. | |
| 2. You should see 'INFO MESSAGE' and 'FINE MESSAGE'. | |
| 3. Adjust the level to be 'INFO' and see that 'FINE' messages are hidden. | |
| 4. Adjust the level to be 'FINE' and see that all messages are displayed. | |
| 5. Adjust the level to be 'SHOUT' and see that no messages are displayed. |