@Override
            public void edgePropertyRemoved(final Edge element, final Property property) {
                assertEquals(e, element);
                assertEquals(label, element.label());
                assertEquals(inId, element.inVertex().id());
                assertEquals(outId, element.outVertex().id());
                assertEquals("dah", property.value());
                assertEquals("to-drop", property.key());
                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