SpaceContainer tests generic for orientation
SpaceContainer tests generic for orientation

This refactors the SpaceContainer tests so that we can add the same
series of tests for both vertical and horizontal orientations.

[endlessm/eos-sdk#2754]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib