How to locate Intellji IDEA "Generate Test" related code?

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Right click on a open Java file, we can get Generate item:

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Then click Test and go on, we can generate target Unit Test:

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I want to develop a new Intellji IDEA plugin base on upper build-in 'Test generator' feature, I want to check related IDEA source code, I just guss may be in some .jar in com.jetbrains.ideaIC library, and fail to locate it for a long time:

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I have no better idea about how to locate the code.

Could you tell me where is the related source code, or how to better locate it?

Thanks for your idea!!!

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