@Override
            public void edgeRemoved(final Edge element) {
                assertThat(element, instanceOf(DetachedEdge.class));
                assertEquals(label, element.label());
                assertEquals(inId, element.inVertex().id());
                assertEquals(outId, element.outVertex().id());
                triggered.set(true);
            }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/decoration/EventStrategyProcessTest.java