The disagreement over whether to write a unit test or an end-to-end evaluation for an element of a software system is something I have encountered a number of times. It mostly appears as a philosophical conversation along the lines when we can only write one test for this feature, should we write a unit test or an end-to-end test? Basically, time and resources are limited, so what type of test would be most effective? In this article, I'll provide my view on this question. I must be aware that my experience has been in building software infrastructure for industrial applications -- streaming data system for near-real-time data. For someone who has worked in another domain, where calculating and analysing the whole software process is simpler, or at which the functional environment is more forgiving of mistake, I could understand the way their experience might be different. I've worked on hosted solutions in addition to infrastructure that's installed on-premises and operate
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