use filename_to_list from filemanip in analyze_pair_image_files

Author: oesteban

nipype/testing/fixtures.py

@@ -22,7 +22,7 @@
 
 
 def analyze_pair_image_files(outdir, filelist, shape):
-    for f in filelist:
+    for f in filename_to_list(filelist):
         hdr = nb.Nifti1Header()
         hdr.set_data_shape(shape)
         img = np.random.random(shape)