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Software development is an expensive process and one of the most costly components in it is maintenance. This is an oddity, since software is not actually subject to wear and tear. It is however prone to error or malfunction and having to fix bugs in already deployed software is what can cause costs to explode. In that respect, bugs are like aging wine. The older they get, the more expensive, they become. This makes it desirable to catch them as early as possible, by rigorously testing code before it makes it's way into a finished product.