you need to test your application? be happy you used an application context that you can redirect to your functional test service. what if some use cases require you use s3 to retrieve the different words? thank god you used interfaces and beans for the implementation. what if requirements change and you need a new upper bound? well it's good that you have that wrapped into configuration so you don't need to restart the service to pick up the change.
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in reply to @hayley's post:
Look at that subtle configuration injection, oh god. It even does cqrs...
Meanwhile in gamedev:
"that many print calls seems expensive, can we bake the fizzbuzz instead?"