add some test case for sum2 function.

crossoverJie / JCSprout

👨‍🎓 Java Core Sprout : basic, concurrent, algorithm

https://crossoverjie.top/JCSprout

MIT License

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Closed vukihai closed 4 years ago

vukihai commented 5 years ago

如果是文字类 PR，请按照中文排版指北进行编写(提交时可删除该提示)。

What kind of change does this PR introduce? (check at least one)

The description of the PR: I've added some test cases for sum2 function :). Other information:

crossoverJie commented 4 years ago

No need for test code.