TEST: detect_vertebral_levels: now testing integrity
TEST: detect_vertebral_levels: now testing integrity

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Former-commit-id: 521ac68250cb9ab84b00ead455082840826e8156
Former-commit-id: 56ae6a6eb1f6b201887623dc2e024956b68ea3b7
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox