Tests can be categorized according to the amount of code they exercise: a unit test verifies the functionality of a single software component, such as a function or a class.
可以将测试按照测试代码的多少分类：“单元测试”检验单一组件的功能，比如一个函数或者一个类。
In contrast, cognitive function test scores continued to decline in the group that didn't have vigorous exercise.
相比之下，那些没有进行高强度锻炼的人，在做认知能力测验的时候，得分还在降低。
Xml2json_test.php - A test driver to exercise the xml2json conversion function.
xml2json _ test . php——执行xml2json转换函数的测试驱动程序。
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