Added support for module dependencies.
增加了对模块依赖项的支持。
An application that adheres to this standard requires a module loader to load modules on request, and resolve inter-module dependencies.
采用这个标准的应用程序需要一个模块加载器来按需加载模块，并解析模块间的依赖关系。
After analyzing module dependencies, test case must be designed for each module in the source file, to achieve some test coverage criteria, and to ensure test adequacy.
分析模块依赖关系之后，需对源代码中各个模块设计测试用例，以达到一定的测试覆盖标准，保证测试的完整性。
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