Fixing condition in _copyheader_update of ANTs's ImageMath interface

Author: dmartindeblas

nipype/interfaces/ants/tests/test_auto_ImageMath.py

@@ -6,6 +6,7 @@ def test_ImageMath_inputs():
     input_map = dict(
         args=dict(
             argstr="%s",
+            position=-1,
         ),
         copy_header=dict(
             usedefault=True,
@@ -27,11 +28,11 @@ def test_ImageMath_inputs():
             argstr="%s",
             extensions=None,
             mandatory=True,
-            position=-2,
+            position=-3,
         ),
         op2=dict(
             argstr="%s",
-            position=-1,
+            position=-2,
         ),
         operation=dict(
             argstr="%s",

nipype/interfaces/ants/utils.py

@@ -208,7 +208,10 @@ def _operation_update(self):
             self.inputs.copy_header = False
 
     def _copyheader_update(self):
-        if self.inputs.copy_header and self._no_copy_header_operation:
+        if (
+            self.inputs.copy_header
+            and self.inputs.operation in self._no_copy_header_operation
+        ):
             warn(
                 f"copy_header cannot be updated to True with {self.inputs.operation} as operation."
             )