The basic concept of test-driven development is that before writing project code, you write a simple piece of code that tests your hypothetical project code for desired behavior.
测试驱动开发的基本概念是，在写项目代码之前，你写一段简单的代码来测试你假设的项目代码，以获得预期的反应。
Must and may behavior is a fundamental concept of UML and of software development in general.
一般来说，必须和可能行为是UML和软件开发的基本概念。
The basic concept of test-driven development is that before writing project code, you write a simple piece of code that tests your hypothetical project code for desired behavior.
测试驱动开发的基本概念是你在写代码之前，你先写一小块代码，用于测试你假想的项目代码是否实现了预期的行为。
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