How To Create An Anti-corruption Layer

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This is a work in progress from The Pipeline. It will likely change before it is published to the main listing of articles. It is currently at the "outlined" stage.

Intro (see previous article about why this is important)
Steps:
1. Find all the code that uses the external service and put it under a new module/class
2. Narrow the interface (refactor)
3. Move initialisation/configuration into a constructor
4. Write integrated tests for the adapter (VCR, etc.)
5. Write a mock adapter, and make it pass the integrated tests
6. Create the adapter at boot time, in a per-environment way
7. Improve any existing tests using the mock adapter
Summary

Got questions? Comments? Milk?

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