@Before
    public void setup() {
        graph = TinkerGraph.open();
        g = graph.traversal();
    }
It was hard to test the {@link IO#registry} configuration as a generic test. Opted to test it as a bit of a
standalone test with TinkerGraph.

@author Stephen Mallette (http://stephen.genoprime.com)
tinkergraph-gremlin/src/test/java/org/apache/tinkerpop/gremlin/tinkergraph/process/traversal/step/sideEffect/TinkerGraphIoStepTest.java