FIX: Fixes failing doctests for freesurfer MNIBiasCorrection.

Author: David Ellis

nipype/interfaces/freesurfer/preprocess.py

@@ -1417,7 +1417,7 @@ class MNIBiasCorrection(FSCommand):
     >>> correct.inputs.protocol_iterations = 1000
     >>> correct.inputs.distance = 50
     >>> correct.cmdline
-    'mri_nu_correct.mni --distance 50 --i norm.mgz --n 6 --o out_output.mgz --proto-iters 1000'
+    'mri_nu_correct.mni --distance 50 --i norm.mgz --n 6 --o norm_output.mgz --proto-iters 1000'
 
     References:
     ----------

nipype/interfaces/freesurfer/tests/test_auto_MNIBiasCorrection.py

@@ -20,30 +20,25 @@ def test_MNIBiasCorrection_inputs():
     iterations=dict(argstr='--n %d',
     ),
     mask=dict(argstr='--mask %s',
-    mandatory=False,
     ),
     no_rescale=dict(argstr='--no-rescale',
     ),
     out_file=dict(argstr='--o %s',
     hash_files=False,
     keep_extension=True,
-    mandatory=False,
     name_source=['in_file'],
     name_template='%s_output',
     ),
     protocol_iterations=dict(argstr='--proto-iters %d',
     ),
     shrink=dict(argstr='--shrink %d',
-    mandatory=False,
     ),
     stop=dict(argstr='--stop %f',
-    mandatory=False,
     ),
     subjects_dir=dict(),
     terminal_output=dict(nohash=True,
     ),
     transform=dict(argstr='--uchar %s',
-    mandatory=False,
     ),
     )
     inputs = MNIBiasCorrection.input_spec()