fixed up unittest

Author: tclose

.gitignore

@@ -136,3 +136,5 @@ dmypy.json
 .vscode
 
 upload-token.txt
+
+.DS_Store

pydra/tasks/dcm2niix/tests/test_utils.py

@@ -1,9 +1,10 @@
 from pydra.tasks.dcm2niix.utils import Dcm2Niix
+from fileformats.medimage import DicomDir
 
 
 def test_dcm2niix():
     task = Dcm2Niix()
-    task.inputs.in_dir = "test-data/test_dicoms"
+    task.inputs.in_dir = DicomDir.mock("test-data/test_dicoms")
     task.inputs.out_dir = "test-data"
     task.inputs.compress = "y"
     assert (