For instance, you don't need to add cases where the found href is null - something that shouldn't happen with a well-formed document but sometimes does.
比如，在发现的href为空的地方不需要添加链接—格式良好的文档不应该出现这种情况，但是有时候确实会出现。
The sample provides three simple use cases: add event, list events and edit event.
该示例提供了三个简单的用例：添加事件、列出事件和编辑事件。
For this exercise, the data population goal is to create 20 test plans and add 1000 test cases to each plan.
对于这个练习，数据实现的目标在于，创建20个测试规划，并向每一个规划添加1000个测试用例。
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