Add assert in tests.

theano/tensor/tests/test_basic.py

@@ -3550,6 +3550,8 @@ class T_Join_and_Split(unittest.TestCase):
         m = self.shared(rng.rand(4, 6).astype(self.floatX))
         o = self.split_op(2)(m, 0, [4, 0])
         f = function([], o, mode=self.mode)
+        assert any([isinstance(node.op, self.split_op)
+                    for node in f.maker.fgraph.toposort()])
         o1, o2 = f()
         assert numpy.allclose(o1, m.get_value(borrow=True))
         assert numpy.allclose(o2, m.get_value(borrow=True)[4:])
@@ -3559,6 +3561,8 @@ class T_Join_and_Split(unittest.TestCase):
         m = self.shared(rng.rand(4, 6).astype(self.floatX))
         o = self.split_op(2)(m, 0, [5, -1])
         f = function([], o, mode=self.mode)
+        assert any([isinstance(node.op, self.split_op)
+                    for node in f.maker.fgraph.toposort()])
         self.assertRaises(ValueError, f)