TDD Pro-Tip: Build Cells

TDD Pro-Tip: Build cells — logic nucleus on the inside, environment inputs & outputs on the outside, and a semi-permeable cell wall between the two. The metaphor i’m proposing here is really about the nature of borders in code. Prior to TDD, my grasp of this topic was driven largely by the great theory of object-orientation that began to emerge back in the ’80s and came to dominate the modern s/w landscape. As with so many aspects of the programming …

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