- Created four tasks, `T1` to `T4`.
- Added `T2` and `T3` as blocking tasks for `T1`.
- Created Manifest queries `Blocking`, `Non-Blocking`, `Blocked` and `Unblocked`.
- Closed `T1`. Checked queries. Reopened `T1`.
- Closed `T2`. Checked queries.
- Closed `T3`. Checked queries.
- Queries always returned expected results. Tasks listed iff they had zero/greater-than-zero open blocking/blocked tasks.