fix a test the requested not implemented feature on the sparse type.

theano/tensor/tests/test_sharedvar.py

@@ -419,10 +419,14 @@ def makeSharedTester(shared_constructor_,
                 assert len(topo_cst)==0
 
             # Test that we can take the grad.
-            shape_grad = tensor.grad(x1_specify_shape.sum(), x1_shared)
-            shape_constant_fct_grad = theano.function([], shape_grad)
-            theano.printing.debugprint(shape_constant_fct_grad)
-            shape_constant_fct_grad()
+            if isinstance(x1_specify_shape.type, theano.sparse.SparseType):
+                #SparseVariable don't support sum for now.
+                assert not hasattr(x1_specify_shape, 'sum')
+            else:
+                shape_grad = tensor.grad(x1_specify_shape.sum(), x1_shared)
+                shape_constant_fct_grad = theano.function([], shape_grad)
+                theano.printing.debugprint(shape_constant_fct_grad)
+                shape_constant_fct_grad()
 
             #Test that we can replace with values of the different shape
             # but that will raise an error in some case, but not all