Thanks! I really like the idea of the instrumented ExampleKeyValueStore class which can be defined like this: class ExampleKeyValueStore { ExampleKeyVal

Thanks! I really like the idea of the instrumented ExampleKeyValueStore class which can be defined like this: class ExampleKeyValueStore { ExampleKeyValueStore(KeyValueStore wrapped); int hit_count(); }; That means I can use the real KeyValueStore as a dependency while still testing the caching behavior. Cool!