TDD should lead to better design
TDD should simplify code, not make it more complicated. If your code becomes harder to read or maintain when you make it testable, you're doing TDD wrong.
You can learn two things:
- You can write decoupled code without dependency injection, and
- Maximising code coverage results in diminishing returns.
More complex code often means more cluttered code. Cluttered code is a convenient place for bugs to hide. It's also easier to find things when there's less clutter.
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