Test, Never Trust: Dealing with external services when using Elixir and Phoenix

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In his short story Thin Cities 3, author Italo Calvino describes a city reduced to its plumbing — a network of pipes, stripped of the streets, walls, and floors that would ordinarily conceal them. I like to picture this “thin city” when I’m testing software; diving beneath the superficial layers to probe the essential connections that keep information and experiences flowing.