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This is part 2 in my series of articles about creating a custom field. I recommend reading Part 1: Field type first, if you have not done so already.

Nhưng không phải ai cũng biết rằng Google đã giấu một quả trứng Phục sinh vào nút bấm tưởng chừng bỏ đi đó.

That's really unfortunate, as good testing can have a huge improvement on the quality of a system and, over time, even improve how fast a system can be developed because you spend less time finding and fighting old bugs and more time building things right the first time.