Write the unit test before writing code for class it tests.

首先编写单元测试，然后再编写要测试的类代码。

youdao

In a nutshell, the developer writes a test before writing any code.

简单地说，开发人员在撰写代码之前要撰写一个测试。

youdao

Simply having the discipline to think about how to test my code before writing it makes it better.

只要记住这条规程—在编写代码之前考虑如何测试代码—就可以使代码变得更好。

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Just before an exam, highly anxious test-takers spend ten minutes writing about their worries about the test.

VOA: special.2011.01.20

Before writing this article, I gave Gary Vaynerchuk a test.

FORBES: Gary Vaynerchuk Practices What He Preaches