Send smart emails with ExCampaignMonitor First month of functional programming in Elixir

Using configuration to swap modules for mocks in your Elixir tests.

When you have a service module that does something with a third party using a mock module can prove to be a great tool for testing when you don’t want to depend on that external service. In my post I show you how to do that without dependency injection but rather with elixir’s application configuration.

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