执行。通过和失败的测试数量以确定进度。

Unit testing: Number of tests planned, executed, passed, and failed to determine progress.

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正如书中所指出，为了设置定时器和确定动画的当前进度，需要编写大量必不可少却又一再重复的代码。

As the book illustrates, there is a lot of boiler-plate code required in order to setup timers and determine the current progress of the animation.

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此外，可以映射并保存所有交互，让用户能够追踪开发和测试进度，并且确定问题出在哪。

Further, all interactions can be mapped and saved, enabling users to track development and testing progress, as well as determine where problems and issues occurred.

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