All the Core module in Magento natively comes with Unit and Integration Test.
As a professional Developer, When you create any module for your project, You should have to write Unit Test for your module code to validate your code is errorless.
Write a Unit test for your module, Gives guarantee your code is bug-free with Find problems earlier before going live and if any error available for a code, you can update the code before code is going to a production server.
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