@Test(expected = IllegalArgumentException.class)
    public void shouldFailMergeVWithBadInput() {
        g.inject(0).mergeV(CollectionUtil.asMap(T.value, 100));
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/process/traversal/dsl/graph/GraphTraversalTest.java