Design by Contract, Ruby Style
I recently encountered a situation in which I was writing data to a key/value data store. There was a code layer that insulated the business logic layer from the data store internals. I wanted to be able to unit test this business logic without needing access to the data store.
I could mock the data access layer, but I wanted something more functional — something that would behave like the data store layer, and possibly even be used to test it. I decided to write something mimicking the production data store layer that used a Ruby Hash for storage. How could I use the language to help me know that I had faithfully reproduced all the functions in the original object?
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