updated test for Copy

Author: blakedewey

nipype/interfaces/afni/tests/test_auto_Copy.py

@@ -16,9 +16,10 @@ def test_Copy_inputs():
     mandatory=True,
     position=-2,
     ),
-    out_file=dict(argstr='-prefix %s',
+    out_file=dict(argstr='%s',
     name_source='in_file',
     name_template='%s_copy',
+    position=-1,
     ),
     outputtype=dict(),
     terminal_output=dict(nohash=True,