@Override
    public String toString() {
        return toString("");
    }
@Test
    public void shouldCreateStringWithProcessors() {
        topology.addSource("source", "t")
                .addProcessor("processor", mockProcessorSupplier, "source")
                .addProcessor("other", mockProcessorSupplier, "source");
        final ProcessorTopology processorTopology = topology.getInternalBuilder().buildTopology();
        final String result = processorTopology.toString();
        assertThat(result, containsString("\t\tchildren:\t[processor, other]"));
        assertThat(result, containsString("processor:\n"));
        assertThat(result, containsString("other:\n"));
    }