@Test
    public void shouldReturnEmptyListIfIoKeyNotPresentOnFindByImplementationAndSerializer() {
        final FakeIoRegistry registry = new FakeIoRegistry();
        assertEquals(0, registry.find(GryoIo.class, String.class).size());
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/structure/io/IoRegistryTest.java