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[–] Xyc0 ago 

If you have the tests before you have the code you can make incremental changes and catch the errors without deploying the whole fucking system. If you never have the tests and you only have code then you always have to deploy the whole system to test. While every developer should know the build chain and the operational scenario not everyone should be setting up and deploying complex system tests. If your continuous integration/deployment does this then you are a rare gem.