The test fails because you have not yet built the code for that part of your system.
由于尚没有为系统中的相应部分构建代码，测试失败。
Writing a test before the code means you don't get to do the fun part of the job until the test runs and fails.
在编写代码前编写测试这种作法意味着，在测试运行并失败之前，不会做工作中真正有趣的部分。
The first is that when a small unit test fails, you know exactly which criteria your code doesn't meet.
第一是当一个小的单元测试失败时，你可以准确地知道你的代码不满足哪个条件。
The first is that when a small unit test fails, you know exactly which criteria your code doesn't meet.
第一是当一个小的单元测试失败时，你可以准确地知道你的代码不满足哪个条件。
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