With a good method and a good tool, writing a modern application is easy. But what can you do when you need to work with a piece of "untouchable" legacy code? After all, many companies stick to the old mantra of "if it ain't broke, don't fix it!" For example, you want to show some data, but the data doesn't come from a true database table. Instead it's calculated by a piece of code. And that code runs well, but it's undocumented and nearly unmaintainable — a complex module that ...

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