add inbuilt nipype trait names

Author: yibeichan

example-specs/task/fsl_utils_ExtractROI.yaml

@@ -12,9 +12,9 @@ doctest:
     t_size: 3
     roi_file: test_trim.nii.gz
     cmdline: fslroi test.nii.gz test_trim.nii.gz 0 3
-tests_inputs:
-    - in_file: test.nii.gz
-      t_min: 0
-      t_size: 1
-tests_outputs:
-    - roi_file
+tests_inputs: []
+    # - in_file: test.nii.gz
+    #   t_min: 0
+    #   t_size: 1
+tests_outputs: []
+    # - roi_file

tests/test_task.py

@@ -16,6 +16,8 @@
     "trait_added",
     "trait_modified",
     "environ",
+    "output_type",
+    "crop_list",
 ]