adding a simple example to test issue 2245

Author: djarecka

nipype/interfaces/ants/tests/test_registration.py

@@ -0,0 +1,21 @@
+# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
+# vi: set ft=python sts=4 ts=4 sw=4 et:                                                                                                                 
+
+from nipype.interfaces.ants import registration 
+import os
+import pytest
+
+def test_ants_mand():
+    filepath = os.path.dirname( os.path.realpath( __file__ ) )                                                                              
+    datadir = os.path.realpath(os.path.join(filepath, '../../../testing/data'))                                                                
+
+    ants = registration.ANTS()
+    ants.inputs.transformation_model= "SyN"
+    ants.inputs.moving_image = [os.path.join(datadir, 'resting.nii')]
+    ants.inputs.fixed_image = [os.path.join(datadir, 'T1.nii')]
+    ants.inputs.metric = [u'MI']
+
+    with pytest.raises(ValueError) as er:
+        ants.run()
+    assert "ANTS requires a value for input 'radius'" in str(er.value)
+