[TC_25] NebulOuS reacts to node failure

[Christos-Alexandros Sarros]

Objective:
Test if NebulOuS can detect that a NebulOuS node crashes and re-assigns applications components to other available workers.

Preconditions:
1. NebulOuS core is running.
2. Two NebulOuS nodes are active and registered in NebulOuS.
3. An instance of “Dummy APP” is registered in NebulOuS. The application component is correctly deployed at one of the NebulOuS nodes.

Steps:

Step 1.
- Action: Manually kill (e.g: power off) the NebulOuS node executing the application component.
- Expected result: NebulOuS detects that the application component is not being executed by any node. NebulOuS selects a new node to execute the application component and it is deployed. Application resumes operation. User can see relevant information of the process through the web UI.