@Override
            public <K extends String, V extends String> void forward(final Record<K, V> record) {
                context.forward(record);
            }
Demonstrate the use of {@link MockProcessorContext} for testing the {@link Transformer} in the {@link WordCountTransformerDemo}.
streams/examples/src/test/java/org/apache/kafka/streams/examples/wordcount/WordCountTransformerTest.java