When is testing not unit testing- When is a Test not a Unit-test?

problem ：

I am looking for rules like: I am looking for the following rules ：

A test is not a unit-test if: If , Then the test is not a unit test ：

• it communicates with a database It communicates with the database
• it cannot run in parallel with other tests It cannot run in parallel with other tests
• uses the "environment" like registry or file system Use something like a registry or file system “ Environmental Science ”

What else is there? What else is there ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/5H9E