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My concern with relying on things like these for testing is they're not supported by AWS, so behaviours can easily diverge without you realising.

I think we've got a lot of mileage in the past out of just mocking request/responses when testing AWS interactions. The only time we've ever used a pseudo-service was when testing against the dynamoDB JAR they provide with the SDK.

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That is my first concern as well but testing and bug counts are not an all-or-nothing thing. If something like this can reduce bug counts in a complicated distributed system while reducing costs vs testing against "the real thing" it still may very well be worth it.

Yup. There's nothing to stop some to have a lot of local iterations for speed, and then later when you are satisfied, have the test run on real AWS.

Would save some money too.

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