TST: Test that legacy Merge(0) behavior is preserved

Author: effigies

nipype/interfaces/tests/test_utility.py

@@ -7,8 +7,10 @@
 from tempfile import mkdtemp, mkstemp
 
 import numpy as np
-from nipype.testing import assert_equal, assert_true, assert_raises
+from nipype.testing import assert_equal, assert_true, assert_false, \
+    assert_raises
 from nipype.interfaces import utility
+from nipype.interfaces.base import isdefined
 import nipype.pipeline.engine as pe
 
 
@@ -157,6 +159,10 @@ def test_merge():
         yield assert_equal, res.outputs.out, [0, 1, 2, 3, 4, 5]
 
         node = pe.Node(utility.Merge(), name='merge0')
+        res = node.run()
+        # Test legacy behavior
+        yield assert_false, isdefined(res.outputs.out)
+        # Test list-of-lists merging
         node.inputs.in_lists = [0, [1, 2], [3, 4, 5]]
         res = node.run()
         yield assert_equal, res.outputs.out, [0, 1, 2, 3, 4, 5]