DynamoDB's test strategy

[hitohata]

Now, the test DynamoDB is initialized by the initializer container in the docker-compose. However, I realized that it's useful to create and remove a table inside the test rather than creating one before all tests.

I would like to adopt this strategy.

[hitohata]

This is a backend issue. So, moved it to the backend discussion.
nishiki-tech/nishiki-backend#156