If somehow in your head you believe you don’t have time to write tests or TDD doesn’t make sense to you, this article might change your mind.
If you are trying to apply it or really loving TDD and need further evidence that your love is for real, this will motivate you better by rationalising the facts.
The best part of the article maybe this following anology.
Notice things. In your next full working day, notice how much time you spend in the three behaviors, actual programming, code study, and various GAK activities.
Mahmut Canga 
What do you think?