Create your own interfaces

Created by Jordan Elver / @jordelver

Why?

• Protects you from 3rd parties
• Models your domain
• Allows / promotes change
• Testing

Protects you from 3rd parties

• 3rd party changing their API
• Change / update in one place

Models your domain

• Uses your domain language
• Encapsulates your logic

Allows / promotes change

• The consuming code doesn't have to change
• Designate a public interface
• Keep the same interface

Testing

• Test in isolation (No slow I/O required)
• We can substitute a test double
• It's faster and behaviour is also tested
• Integration tests are a must have

Thanks

:-)