@Override
            public StreamsMetrics metrics() {
                return MockProcessorContext.this.metrics();
            }
Used to get a {@link StateStoreContext} for use with
{@link StateStore#init(StateStoreContext, StateStore)}
if you need to initialize a store for your tests.
@return a {@link StateStoreContext} that delegates to this ProcessorContext.
streams/test-utils/src/main/java/org/apache/kafka/streams/processor/api/MockProcessorContext.java