Flush from the seeInRepository method

Hello. First of all, thank you for the great testing framework.
I would like to clarify how to use the `seeInRepository` method. I have read the documentation and can't understand why this method executes the doctrine's flush. I had a few cases when I had forgotten to add the flush in the app and had got green tests because of this behavior. Maybe the flush from this method is not a good idea?

Issue提到了seeInRepository方法，但没有指出文件或测试。首先在模块中定位该方法，并检查现有的测试覆盖率和文档；要视为完成，必须确定flush行为、提供匹配的测试，并编写解释结果的文档。

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