@Test(expected = IllegalArgumentException.class)
    public void shouldThrowForAddAllIfBothArgsNotCollection() {
        Operator.addAll.apply(Arrays.asList(1,2,3), "not a collection");
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/process/traversal/OperatorExceptionTest.java