@Override
    protected List<Traversal> getTraversals() {
        return Arrays.asList(
                __.project("x", "y"),
                __.project("x"),
                __.project("y"),
                __.project("x", "y").by(__.outE().count()).by("name"),
                __.project("x", "y").by("age").by("name"),
                __.project("x", "y").by(__.outE().count()),
                __.project("x").by(__.outE().count()),
                __.project("y").by("name")
        );
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/ProjectStepTest.java