How write a test when data from the target folder is required

I'm new in JUnit Testing

I have a maven project which creates files in the target folder when it is executed

target
├───allure-results
    │   30176f70-a91c-4f44-a010-e5b38240865d-attachment.txt
    │   6883764c-ddbd-4c98-b9a4-75020cdd344d-result.json

In my program I get these 2 files with the path target/allure-results and modify them. Now I have to write a JUnit test for the method wich modify these two files. Of course when I start my test the target folder does not yet exist.

What is the best practice for this situation? Can I create a "test-target" folder and fill it with files?