[erlang-questions] Unidirectional architectures in Erlang

[Rodrigo Stevaux]

> It's not unheard of that thousands of unit-tests "pass" and everything is
> "ready" and then it all falls like a house of cards with a single naive
> end-to-end flow. ;-)
>

My exact experience. Even though everything passes unit tests, the system
might be mis-configured for example -- moreover if everything is unit
testable, dependency injection is probably being used so configuration
matters.
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