BUG: check returned displayable managers

Add list of expected displayable managers and fail test
if returned list doesn't match in size or if returned managers
are not in the list.



git-svn-id: http://svn.slicer.org/Slicer4/trunk@22593 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Fix vtkMRMLSceneViewNodeStoreSceneTest randomly failing on windows

Allocating a single "vtkMRMLScalarVolumeNode" wasn't enough to ensure
that the space previously used by 'vtkMRMLScalarVolumeNode1' wasn't
available again for the restored volume.

See inlined comment for more details.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22594 3bd1e089-480b-0410-8dfb-8563597acbee