public default GraphTraversalSource traversal(final Graph graph, final TraversalStrategy... strategies) {
        return this.traversal(graph).withStrategies(strategies);
    }
Create a {@link GraphTraversalSource} from a {@link Graph} instance.  The default implementation does not use
{@link GraphComputer} so providers should override as necessary if their implementation is testing
something that requires a different engine type, like {@link GraphComputer}.
<p/>
Implementations should apply strategies as necessary to the
{@link GraphTraversalSource} before calling it's {@code create} method.
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/GraphProvider.java