fix tests

Author: oesteban

nipype/interfaces/freesurfer/tests/test_preprocess.py

@@ -105,7 +105,7 @@ def test_mandatory_outvol(create_files_in_directory):
         ext = ext2 + ext
 
     assert mni.cmdline == (
-        'mri_nu_correct.mni --i %s --o %s_output.%s' % (filelist[0], base, ext))
+        'mri_nu_correct.mni --i %s --o %s_output%s' % (filelist[0], base, ext))
 
     # test with custom outfile
     mni.inputs.out_file = 'new_corrected_file.mgz'
@@ -116,5 +116,5 @@ def test_mandatory_outvol(create_files_in_directory):
     mni2 = freesurfer.MNIBiasCorrection(in_file=filelist[0],
                                         out_file='bias_corrected_output',
                                         iterations=4)
-    assert mni2.cmdline == ('mri_nu_correct.mni --i %s --n 4 --o bias_corrected_output.%s'
+    assert mni2.cmdline == ('mri_nu_correct.mni --i %s --n 4 --o bias_corrected_output%s'
                              % (filelist[0], ext))