Currently we have no test case, as this particular node was previously intended to be obsolete (converted to dummy node) in 0.7.  This migration function is part of the bulk migration in the previous pull request https://github.com/ellensi/Dynamo/commit/4c36f374d53a08b444490ea0dc331ae8e5edb7a1 which purpose was to eliminate all dummy nodes.

But we do have Sample files for this node, inside [02 Ref Grid Sliders](https://github.com/DynamoDS/Dynamo/tree/master/doc/distrib/Samples/02%20Ref%20Grid%20Sliders).