@Parameterized.Parameters(name = "{0}")
    public static Iterable<Object[]> data() {
        return Arrays.asList(new Object[][]{
                {__.inE(), false},
                {__.outE(), false},
                {__.bothE(), false},
                {__.to(Direction.OUT), false},
                {__.toE(Direction.IN), false},
                {__.inE("knows"), true},
                {__.outE("knows"), true},
                {__.bothE("created", "knows"), true},
                {__.to(Direction.OUT, "created", "knows"), true},
                {__.toE(Direction.IN, "knows"), true}
        });
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/EdgeLabelVerificationStrategyTest.java