updated tests

Author: chrisgorgo

nipype/interfaces/mrtrix/tests/test_auto_GenerateDirections.py

@@ -23,8 +23,9 @@ def test_GenerateDirections_inputs():
     ),
     out_file=dict(argstr='%s',
     hash_files=False,
+    name_source=['num_dirs'],
+    name_template='directions_%d.txt',
     position=-1,
-    usedefault=True,
     ),
     power=dict(argstr='-power %s',
     ),