fix: added test for first name generator

Author: satra

nipype/interfaces/fsl/tests/test_preprocess.py

@@ -10,7 +10,7 @@
                             skipif)
 
 from nipype.utils.filemanip import split_filename
-import nipype.interfaces.fsl.preprocess as fsl
+from .. import preprocess as fsl
 from nipype.interfaces.fsl import Info
 from nipype.interfaces.base import File, TraitError, Undefined, isdefined
 from nipype.interfaces.fsl import no_fsl
@@ -567,5 +567,15 @@ def test_fugue():
 
 
 @skipif(no_fsl)
-def test_first_genfname:
-    
+def test_first_genfname():
+    first = fsl.FIRST()
+    first.inputs.out_file = 'segment.nii'
+    first.inputs.output_type = "NIFTI_GZ"
+
+    value = first._gen_fname(name='original_segmentations')
+    expected_value = os.path.abspath('segment_all_fast_origsegs.nii.gz')
+    yield assert_equal, value, expected_value
+    first.inputs.method = 'none'
+    value = first._gen_fname(name='original_segmentations')
+    expected_value = os.path.abspath('segment_all_none_origsegs.nii.gz')
+    yield assert_equal, value, expected_value