@Override
            public void vertexPropertyChanged(final Vertex element, final VertexProperty oldValue, final Object setValue, final Object... vertexPropertyKeyValues) {
                assertEquals(v, element);
                assertEquals(label, element.label());
                assertEquals(id, element.id());
                assertEquals("to-change", oldValue.key());
                assertEquals("blah", oldValue.value());
                assertEquals("dah", setValue);
                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