@Then("the result should be empty")
    public void theResultShouldBeEmpty() {
        assertThatNoErrorWasThrown();

        assertThat(result, instanceOf(Collection.class));
        assertEquals(0, IteratorUtils.count((Collection) result));
    }
Some implementations of {@link VertexProperty} are not {@code Serializable} and may lead to test failures when passed as
parameters. One such instance is {@code HadoopVertexProperty}. This method detaches vertex properties as tests
should never require implementation-specific elements.
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/features/StepDefinition.java