Validate the function name in sct_testing (#1305)
Validate the function name in sct_testing (#1305)

Provide a warning if the function name is not in the list of test functions.

Fixes #473

Former-commit-id: 0e25daab8724a15525a5eb87807412eeede604b2
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox